1 24/7 Live Expert Opposite faces are congruent. There are a few different ways to figure out what size you [], If you want to know how much water a certain tank can hold, you need to calculate the volume of that tank. You can use this formula for any rectangular prism, and you will always get the surface area. If l is the length, and h is the height and w is the width of the rectangular prism, the surface area is given by the formula. Let us see the basic formulas to calculate the total surface area and lateral surface area of a rectangular prism in the next section. Cylinders work also, but C is used in the place of P and is 2 r and B = r^2, so S = 2 r H + 2 r^2 = 2 r (H + r). Equation form: Surface Area (SA) =3 * 3 * l + 6 * l * h. Volume (V) =. Add them all together to get the area of the whole shape: lw + lw + wh + wh + lh + lh. It is one of the basic things to learn if you are studying or interested in math. The lateral area of a three-dimensional solid is the area of all the lateral faces. I can solve any mathematic question you give me. The Surface Area of a prism is the sum of the areas of all its faces. The surface area of a rectangular prism calculator gives us the answer: A = 2 l w + 2 l h + 2 w h = 2 8 ft 6 ft + 2 8 ft 5 ft + 2 6 ft 5 ft = 236 ft. Calculate the unknown defining side lengths, circumferences. Your Mobile number and Email id will not be published. Get the rectangular prism diagonal, length, and height. 3 * 3 * l * h. 2. Rectangular prism length is 82 mm, width is 40 mm, height is 25 mm, volume is 82,000 mm, daigonal length is 94.59 mm, and surface area is 12660 mm. WebThe lateral surface area is the product of the perimeter and the total height of the prism. Two boxes each of dimensions (4 inches 5 inches 6 inches) are joined together face to face to make a rectangular prism box. Rectangular prism is a six-faced three-dimensional form with all sides (top, bottom, and lateral sides) rectangles and all opposite faces congruent. You can simply calculate the missing side of a rectangular prism when you have volume, other 2 sides dimensions. If not, convert them into the same units. WebThe Free Math Tutor 10.9K subscribers This video illustrates how to use the formula for Lateral Area of a Rectangular Prism. The following steps depict how to find the area. With this test grade calculator, you'll quickly determine the test percentage score and grade. Enter the width (or breadth) of the rectangle in its appropriate field. For its calculation, two dimensions are involved, thus we measure it in square units. Input the variables into the calculator and you will receive the volume and total surface of this figure. To obtain the surface area for different lengths, breadths, and heights of the rectangular prism, click the Reset button. WebGiven below are some properties pertaining to a rectangular prism. The lateral surface area of a rectangular prism can be calculated by finding the sum of all the lateral faces of the prism, i.e. For a rectangular prism, the base is always a rectangle. Experience Cuemath and get started. Ensure you've picked the suitable units. The rectangular prism [], In this beginners guide, well explain what a cross-sectional area is and how to calculate it. See if you get the right answers. The surface area of a rectangular prism is defined as the area of all the rectangular faces of the prism. Rectangular Prism Calculator (Cuboid) Rectangular Prism Calculator Choose a Calculation height h = Units Significant Figures Answer: l = width w = height h = diagonal d = total surface area S tot = lateral surface area S lat = top surface. Also, the lateral surface area of a rectangular prism can be calculated using the formula, LSA of rectangular prism = 2(l + b)h square units. and so on). BYJUS online surface area of a rectangular prism calculator tool makes the calculation faster and it displays the surface area of a rectangular prism in a fraction of seconds. A prism with rectangular bases faces is known as a rectangular prism. Next, find the area of the two triangular faces, using the formula for the area of a triangle: 1/2 base x height. A prism has two kinds of surface areas, namely the lateral surface area and the total surface area. To determine a prisms surface area, we must calculate the areas of each of its faces, then add the resulting areas. We know that, surface area of rectangular prism is calculated as, S u r f a c e a r e a = 2 ( w i d t h l e n g t h) + 2 ( l e n g t h h e i g h t) = 2 ( 7 12) + 2 ( 12 3) = 168 + 72 = 240 i n 2. The last step is to find the lateral surface area of the cylinder using the formula below: Thus, the lateral surface of the cylinder is 10 cm * 12 cm = 120 cm 377 cm. The surface area of a rectangular prism can be calculated using the following steps: Now that we know the formula and method to calculate the surface area of a rectangular prism, let us now understand how to calculate it with the help of an example. WebSurface Area of a Rectangular Prism Calculator with steps. No matter what you're writing, it's important to be versatile and adapt to your audience. The lateral area for a triangular prism is the sum of areas of its side faces (which are 3 rectangles). 2lb = 2 (24 15) = 2 360 = 720 inch2. You must know the width, length and height of the prism before you can apply this formula: In this formula we have abbreviations for width (w), length (l) and height (h), and we can simplify that by factoring out the 2: Since every face of a rectangular prism has a congruent, opposite face, you are tracking down all six faces in pairs. Hence, we obtain surface area 4 times the original one in this case. Work first; then peek. Dooley's Calculator Rectangular Prisms Enter values for Height: Area of the Base: Volume: What is the perimeter of a rectangular prism and how you calculate it? Other name for rectangular prism is cuboid. But that is the surface area of the entire prism, and we don't want to tile it all around. Example 1: Find the volume, surface area, length of a rectangular prism whose diagonal, width, and height are 10.77 cm, 6 cm, and 4 cm, respectively? Ensure you've picked the suitable units. This surface area of a rectangle calculator is simple to use: Enter the length of the rectangle in its appropriate field. There are many different forms that can be used to provide information. Finds the total area contained by the three rectangular sides of the prism. The Calculator. Part 2. Example: Determine the total surface area of a rectangular prism with the following dimensions: Solution: The total surface area of the rectangular prism is given by: 2(lb + bh + lh) = 2(8 5 + 5 7 + 8 7) = 2(40 + 35 + 56) = 2 131 = 262 inch2. WebA hexagonal prism, also called an octahedron, is a type of prism that is characterized by a hexagonal base. Finally, the obtained value is called space diagonal length. A rectangular prism can be classified as a right rectangular prism or an oblique rectangular prism. Draw a net diagram using the. 2. Step 3: Finally, the surface area of a rectangular prism will be displayed in the output field. Perimeter of the base, use (, , and so on) Lateral Area, use (, , and so on). It gives faster and accurate measures of a rectangular prism easily. Double the result to get the total surface area. For a rectangular prism, the base is always a rectangle. The lateral surface area is the surface area of a 3D object, excluding the area of its top and base. The total of all the lateral faces of a rectangular prism, i.e. WebThe procedure to use the surface area of a rectangular prism calculator is as follows: Step 1: Enter the length, width and height in the input field Step 2: Now click the button Solve Local and online. If that is the case, then this is the right place for you. An Oblique Prism is one that is not a right prism. A rectangular prism is a polyhedron, and every face is a rectangle. Given the volume, length and width find the height, surface area, and diagonal of a rectangular prism V, l and w are known; find h, S and d h = V / lw S = 2 Surface area is [(a + b +c )(b + c - a)(c + a - b)(a + b - c)] + h(a + b + c). Cylinders work also, but C is used in the place of P and is 2 r and B = r^2, so S = 2 r H + 2 r^2 = 2 r (H + r). For example, we can relate the surface area of a rectangular prism with the surfaces of the objects given below: a book, cuboid-shaped aquarium, box, etc. Subtract diagonal square from the length square, width square. Given height h and edge length a, the surface area can be calculated using the following equations: base SA = a 2. lateral SA = 2a (a/2)2 + h2. WebAnswer: Lateral area of sphere = 201.142 square units, and Lateral/ curved surface area of hemisphere = 100.571 square units. 2. Note: The unit of measurement of the area of the rectangular prism is square units. WebRectangular prism calculator lateral surface area - We discuss how Rectangular prism calculator lateral surface area can help students learn Algebra in this blog post. If lateral faces, bases are rectangles, then it is called a cuboid. Please pick an option first. The entire region or area covered by all of the faces of the prism is defined as the surface area of a rectangular prism. A rectangular bedroom with one wall being 15 feet long and the other being 12 feet long is simply 12 x 15 = 180 square feet. A rectangle is one of the many fundamental shapes you'll see in math. You'll see how to apply each formula to the given information to find the lateral area and surface area. It is used to solve problems in a variety of fields, from engineering to economics. Find the rectangular prism length, width, and height. We can calculate rectangular prisms lateral surface area (LSA) using this equation: LSA = 2 \times (l + b) \times h where: l = length, b = width, and h = height. The surface area of a rectangular prism is the total area of all six faces. In this tutorial, take a look at the term congruent! [8] To finish our example, just add up all the blue numbers above: 12 + 12 + 15 + 15 + 20 + 20 = 94 square inches. Get better grades with tutoring from top-rated private tutors. WebCalculate rectangular pyramid surface area step by step. The cage is 1.5 yards long, 0.25 yards wide and 0.25 yards high. A prism has two kinds of surface areas, namely the lateral surface area and the total surface area. Required fields are marked *, Surface Area Of A Rectangular Prism Calculator, Surface Area of a Rectangular Prism Calculator is a free online tool that displays the rectangular prism surface area. Amazing app. Surface_area = 2 base_area +. You must know the width, length and height of the prism before you can apply this formula: A=2wl+2lh+2hw A = 2wl + 2lh + 2hw We can calculate rectangular prisms lateral surface area (LSA) using this equation: LSA = 2 \times (l + b) \times h where: l = length, b = width, and h = height. The total region or area covered by all the faces of a rectangular prism is defined as the surface area of a rectangular prism. The lateral surface is also composed of rectangles. But that is the surface area of the entire prism, and we don't want to tile it all around. WebThe surface area of a rectangular prism can be calculated using the following steps: Step 1: Check if the given dimensions of the rectangular prism are in the same units or not. We can calculate rectangular prisms lateral surface area (LSA) using this equation: Please follow the steps below to calculate the surface area of a rectangular prism: Lets imagine you are tiling a swimming pool (or some kind of box) and want to know how much tile you will need. Learn more about its volume with this Volume of a Rectangular Prism Calculator. The Lateral Area of a prism is the sum of the areas of its lateral faces. You can calculate the lateral surface of a cylinder in four steps: No, the lateral surface cannot be negative. Find the areas of each of the three rectangular faces, using the formula for the area of a rectangle: length x width. When you have a cube, finding the area of one face allows you to find the total surface area of the solid very quickly, since it will be six times the area of one face. There are two sorts of areas: Determining the total area of all six faces can be used to compute the total surface area of a rectangular prism. A rectangular prism is a polyhedron, and every face is a rectangle. Enter the width (or breadth) of the rectangle in its appropriate field. WebThe surface area of a square pyramid is comprised of the area of its square base and the area of each of its four triangular faces. WebThe surface area of a rectangular prism calculator gives us the answer: A = 2 l w + 2 l h + 2 w h = 2 8 ft 6 ft + 2 8 ft 5 ft + 2 6 ft 5 ft = 236 ft. This tutorial defines the term prism and shows you how to name a prism using the shape of its bases. WebThe word "lateral" means "belonging to the side". The formula for calculating a surface area is as follows. To calculate the surface area of a rectangular prism, click the Calculate button. Again, ensure that you've picked the correct units. Looking for a quick and professional tutoring services? WebThe general formulas to calculate the total surface area of a rectangular prism are one is perimeter * prism_height + base * traingle height. Let's build our equation for surface area of a rectangular prism starting with our formula: Though that sounds like a lot of gift wrap, it is only0.27m20.27{m}^{2}0.27m2. Try this helium balloons calculator! I can help you with any mathematic task you need help with. To understand how do you find the lateral surface area of a cylinder, let's take a cylinder with the following attributes as an example: You can find the lateral surface area of a cylinder in four steps: The radius, r, is the distance from the center of the circle to its edge. the total area excluding the area of the bases. Pictures of each shape are included. The Lateral Area of a prism is the sum of the areas of its lateral faces. Apply square root to the result to check the height. The total surface area of a rectangular prism refers to the area of all six faces, while the lateral surface area covers the area of only the lateral faces and thus doesn't include the base areas. 4. The height of the cylinder, h, is 12 cm in our example. w is width. Both blank and filled in Formula Sheets for Lateral Surface Area, Total Surface Area and Volume of a Prism, Cylinder, Pyramid, Cone and Sphere. Surface Area of Rectangular Prism Worksheets, Surface Area of a Rectangular Prism Formula. WebThe lateral surface area is the product of the perimeter and the total height of the prism. where. How to find the lateral surface area of a cylinder? Step 2: Now click the button Solve to get the rectangular prism surface area. WebRectangular Prism Calculations: If the surface area, length, and width of rectangular prism are given, then Height h = (S - 2lw) / (2l + 2w) Diagonal length d = (l + w + h) Volume V = lwh If the length, volume, and width of rectangular prism are given, then Height h = V / lw Surface Area S = 2 (lw + lh + wh) Surface_area = 2 base_area +. = 7 5 + 2 7 9 + 2 5 9 Step 2: Once the dimensions are in the same units, understand the need to calculate the lateral surface area or the total surface area 20+ tutors near you & online ready to help. The opposite faces of the rectangular prism are equal in measure, and it has 8 vertices and 12 sides. Free time to spend with your family and friends. Lateral surface area = perimeter height L.S.A = 2 ( l + b ) h Here, l = length, b = breadth, h = height You can use Cuemath's Online Surface Area of a Rectangular Prism Calculator to find the surface area of a rectangular prism. The Surface Area of a prism is the sum of the areas of all its faces. The steps are along the lines. 14 h = 56 WebThis pyramid calculator can help you calculate the volume, base, lateral and surface areas, height or base width & length of any right rectangular pyramid if you know the required dimensions. Lateral surface The sides of the rectangular prism connecting the two rectangles at the base, but excluding the base. This surface area of a rectangle calculator is simple to use: Enter the length of the rectangle in its appropriate field. Draw a net diagram using the. WebSo if you can find the base (it could be a triangle, rectangle, parallelogram, etc.) Subtract the product from the surface area. The calculation excludes the the top and base circles' area. 20 + 14 h = 76 The area of an open box (a box without a lid), can be determined by calculating the total area of 5 surfaces: Total surface area of the rectangular prism (open box) = lb + 2lh + 2bh WebA hexagonal prism, also called an octahedron, is a type of prism that is characterized by a hexagonal base. Surface Area, use (, , and so on). 1 24/7 Live Expert and can calculate the area and perimeter, you can find the surface area. 2. Maybe, you were wondering how to solve the surface area of a rectangular prism or what the lateral surface area of a rectangular prism is in the first place? Keywords: rectangular prism; prism; lateral area; surface area; solve; formula; rectangle; base; lateral face; area; congruent bases; i.e., it is the total surface area minus the areas of the two bases.It is also known as the lateral surface area (LSA). where. Reciprocal Calculator (Multiplicative Inverse Calculator), If youre looking to buy a hat, knowing your hat size is essential. Please pick an option first. Math can be tough, but with a little practice, anyone can master it. PDF. What is the lateral surface area of a cylinder? WebSo if you can find the base (it could be a triangle, rectangle, parallelogram, etc.) Divide the volume by product of height, width to check the length. For example, let's say there is a box that needs to be gift-wrapped. Lateral surface The sides of the rectangular prism connecting the two rectangles at the base, but excluding the base. w is width. It can be calculated by following the steps given below: Step 1: Determine the area of the top and bottom faces of the box. All you have to do is enter the known parameters in the below sections and press the calculate button to generate the exact output. pyramid, rectangular prism, sphere, spherical cap, and triangular prism. h = 56/14 = 4 ft. WebRectangular prism calculator lateral surface area - We discuss how Rectangular prism calculator lateral surface area can help students learn Algebra in this blog post. Your Mobile number and Email id will not be published. A cylinder is an 3D object that is bound by a cylindrical surface and 2 circles, both on top and bottom. Do you think you will have enough? Get the square of diagonal, length, and width. The formula to find the surface area of a rectangular prism is given as. WebRectangular Prism Calculator Rectangular Prism Units of Measure Area of the Base, use (, , and so on). But that is the surface area of the entire prism, and we don't want to tile it all around. Finds the total area contained by the three rectangular sides of the prism. Amazing I have got completely correct math homework that only takes me 10 seconds to do which is convenient as I ride my pony after school and so don't have much time as the annoying spanish teacher keeps replacing all our preps with spanish. This prism is also known as a cuboid (cube). Wondering how many helium balloons it would take to lift you up in the air? WebRectangular Prism Calculator (Cuboid) Rectangular Prism Calculator Choose a Calculation length l = width w = height h = Units Significant Figures Answer: length l = width w = height h = diagonal d = total surface area S tot = lateral surface area S lat = top surface area S top = bottom surface area S bot = volume V = Given height h and edge length a, the surface area can be calculated using the following equations: base SA = a 2. lateral SA = 2a (a/2)2 + h2. where, l is length. $1.50. The unit of measurement for the surface area of a rectangular prism is square units or (unit)2. WebThe procedure to use the surface area of a rectangular prism calculator is as follows: Step 1: Enter the length, width and height in the input field. Want to build a strong foundation in Math? A rectangular prism is a three-dimensional solid that has all its lateral faces in a rectangleshape. Surface Area of a Rectangular Prism Calculator Online calculators and formulas for a surface area and other geometry problems. Base perimeter, 2(l + b) = 14 ft WebThe lateral area of a three-dimensional solid is the area of all the lateral faces. 2. The quantity of space that covers the outside of a three-dimensional form is called the surface area. If two figures have the same size and shape, then they are congruent. h is height. Before looking at the answers, try your hand at both! A special type of rectangular prism is acube, in which all six faces are congruent. To begin, the length and width of our pools base, which in our case are 6 ft and 4 ft, respectively, are the sides of the pools base. You must know the width, length and height of the prism before you can apply. Step 2: Once the dimensions are in the same units, understand the need to calculate the lateral surface area or the total surface area In order to compute the surface area of a rectangular prism, all we have to do is add the areas of the prisms faces. All faces of the prism are rectangles. Surface Area of aRectangular Prism Calculator. Both blank and filled in Formula Sheets for Lateral Surface Area, Total Surface Area and Volume of a Prism, Cylinder, Pyramid, Cone and Sphere. Also given are the area of a square/rectangle, triangle, Pythagorean Theorem, and circumference and area of a circle. 2. 2bh = 2 (15 20) = 2 300 = 600 inch2, 2lh = 2 (24 20) = 2 480 = 960 inch2. Base The surface at the two ends of the prism. The Calculator. WebThis pyramid calculator can help you calculate the volume, base, lateral and surface areas, height or base width & length of any right rectangular pyramid if you know the required dimensions. You need to cover the travel cage for your pet boa constrictor so you can carry it on the school bus. The surface area of a rectangular prism calculator gives us the answer: A = 2 l w + 2 l h + 2 w h = 2 8 ft 6 ft + 2 8 ft 5 ft + 2 6 ft 5 ft = 236 ft. This tutorial introduces you to rectangles and explains their interesting qualities! But that is the surface area of the entire prism, and we don't want to tile it all around. Check out the rectangular prism surface area, height, and width. Each rectangular prism has 6 regular faces, 8 vertices, and 12 edges. But that is the surface area of the entire prism, and we don't want to tile it all around. Example 3: Find the lateral area of the cube using the lateral area formula whose side is 7 units. Surface_area = 2 base_area +. It's an amazing source of checking your work, and It includes clear examples and explicit instructions, and explanations to help you! A rectangular prisms total surface area (TSA) is equal to: The total of all the lateral faces of a rectangular prism, i.e. What I want to Find. Lesson on Finding Surface Area of a Rectangular Prism Using the Formula from www.youtube.com Determine the Go beyond memorizing formulas and understand the why behind them. For its calculation, two dimensions are involved, thus we measure it in square units. Finding surface area for all rectangular prisms (including cubes) involves both addition and multiplication. Answer: Emily should buy 251 inch2 of cardboard. 3. The lateral area for a triangular prism is the sum of areas of its side faces (which are 3 rectangles). Check out 23 similar 3d geometry calculators . A rectangular prism is a three-dimensional shape. Want to know how the find the lateral and surface areas of a triangular prism? 3. WebThe surface area of a rectangular prism calculator gives us the answer: A = 2 l w + 2 l h + 2 w h = 2 8 ft 6 ft + 2 8 ft 5 ft + 2 6 ft 5 ft = 236 ft. = 251 inch2. Next, find the area of the two triangular faces, using the formula for the area of a triangle: 1/2 base x height. In this tutorial, you'll see how to use the dimensions of a rectangular prism to find the lateral area. 2 10 + 14 h = 76 Base The surface at the two ends of the prism. If you want to get the best homework answers, you need to ask the right questions. Subtract diagonal square from the length square, and height square. Therefore, both the bases of a rectangular prism must also be rectangles. For a cube or rectangular box, the formula becomes even easier. If all the edges of a rectangular prism are equal to 'l', then the volume of the prism is 'l, Area of 4 lateral faces or lateral surface area: 2(l + b)h = 2lh + 2bh. Surface Area Given Lateral Surface Surface Area Given Height Lateral Surface. Comment on David Severin's post Any prism is given by SA Both blank and filled in Formula Sheets for Lateral Surface Area, Total Surface Area and Volume of a Prism, Cylinder, Pyramid, Cone and Sphere. Using the surface area of a prism formula, determine its height. WebThe lateral surface area is the product of the perimeter and the total height of the prism. Surface Area Given Lateral Surface Surface Area Given Height Lateral Surface. We can calculate rectangular prisms lateral surface area (LSA) using this equation: LSA = 2 \times (l + b) \times h where: l = length, b = width, and h = height. Solution: To find: lateral area of a cube Given that: side of a cube = 7 units Using lateral area formula of cube = 4a 2 Note that in a right prism, the height and the slant height are the same. Base area, lb = 10 ft2 As a result, the bases of this prism must be rectangles. It has six sides, each of which is rectangular. You need864in2864i{n}^{2}864in2of paper, which is only six square feet! Total surface area = 2(lb + bh + lh) = 76 ft2, Substituting values, we get, WebThe word "lateral" means "belonging to the side". Formula: Lateral SA rp = Ph P - the perimeter of the base rp Annulus Area WebHere, we have to calculate lateral and surface area of rectangular prism. Volume, use (, , and so on). You can think of the lateral surface area as the total surface area of the prism minus the two triangular areas at the Sure, even if you leave a little extra for overlap, since you have0.375m20.375{m}^{2}0.375m2and only need0.27m20.27{m}^{2}0.27m2! Given the volume, length and width find the height, surface area, and diagonal of a rectangular prism V, l and w are known; find h, S and d h = V / lw S = 2 You can useCuemath's Online Surface Area of aRectangular Prism Calculatorto find the surface area of a rectangular prism. WebCalculate rectangular pyramid surface area step by step. Comment on David Severin's post Any prism is given by SA There are different types of prisms, namely - triangular prisms, square prisms, rectangular prisms, pentagonal prisms, hexagonal prisms, etc. Observe the prism volume, height, and length. Dooley's Calculator Rectangular Prisms. Here are some cylinder related calculators. You can use math to determine all sorts of things, like how much money you'll need to save for a rainy day. $1.50. 3 * 3 * l * h. 2. Our tutors are experts in their field and can help you with whatever you need. WebSurface Area of Rectangular Prism Calculator . = 35 + 126 + 90 the total area excluding the bases, can be used to compute the lateral surface area. What I want to Find. The lateral surface area is the productof theperimeter and the total height of the prism. This is because all 3D object will have a surface. Example: Determine the minimum area of the wrapping paper required to wrap a rectangular gift box with dimensions as given below: Solution: In this case, we have to find the total surface area of the box. Surface Area of a Rectangular Prism Calculator How to Use? Total surface area of a rectangular prism = 2(lb + bh + lh) square units If not, convert them into the same units. Looking for a way to get detailed step-by-step solutions to your math problems? Enter values for: Length: Width: Height: Area of the Base: Volume: Perimeter of the Base: Lateral Area: Surface, How to tell if two vectors are perpendicular. Surface area of a rectangular prism formula Finding surface area for all rectangular prisms (including cubes) involves both addition and multiplication. You can think of the lateral surface area as the total surface area of the prism minus the two triangular areas at the What is another name for a rectangular prism? Step 3: Finally, the surface area of a rectangular prism will be displayed in the output field. Step 3: Finally, the surface area of a rectangular prism will be displayed in the output field. A rectangular prism can have two types of areas: The total surface area of a rectangular prism can be calculated by finding the total area of all six faces. If you're having trouble understanding a math question, try clarifying it by rephrasing it in your own words. WebRectangular Prism Calculator Rectangular Prism Units of Measure Area of the Base, use (, , and so on). It can also be interpreted as half go the diameter, as displayed in the in the formula below: In this example, the r is 10 cm / 2 = 5 cm. In this tutorial, you'll see how to use the dimensions of a rectangular prism to find the lateral area. Note that in a right prism, the height and the slant height are the same. [8] To finish our example, just add up all the blue numbers above: 12 + 12 + 15 + 15 + 20 + 20 = 94 square inches.