Total surface area of rectangular prism
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Transcript of Total surface area of rectangular prism
![Page 1: Total surface area of rectangular prism](https://reader033.fdocuments.us/reader033/viewer/2022052700/55a1ba041a28ab92058b45d5/html5/thumbnails/1.jpg)
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Each side of a rectangular prism is called a face.
A rectangular prism has six faces.
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In a rectangular prism there are 3 pairs of opposite and equal sides. The first pair is the red face
7 cm (l)
4 cm (b)
10 cm (h)
10 cm (h
7 cm (l)
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We can see another face - just like the red face. That is on the back.
7 cm(l)
10 cm(h)
7 cm(l)
10 cm(h)
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Now there are 2 rectangles that each have an area of 70cm² ie
lh+lh=2lh
l x h= 7 x 10= 70cm²
70 cm
2
70 cm
2
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The second pair is the blue face
10 cm (h)
4 cm (b)
7 cm (l)
4 cm (b)
10 cm (h)
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We can see another face - just like the blue face. That is on the left side.
10 cm (h)
4 cm (b)
4 cm (b)
10 cm (h)
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Now there are 2 rectangles that each have an area of 40cm² ie
bh+bh=2bh
40cm²
40cm²
b x h= 4 x 10= 40cm²
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The third pair is the green face
10 cm (h)
4 cm (b)
7 cm (l)
7 cm (l)
4 cm (b)
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We can see another face - just like the green face. That is on the bottom.
4 cm (b) 4 cm (b)
7 cm (l) 7 cm (l)
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Now there are 2 rectangles that each have an area of 28cm² ie
lb+lb=2lb
28cm²
28cm²
l x b= 7 x 4= 28cm²
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Now we just need to add all the areas of the sides together.
+ +
+ + 28cm
2
40cm
2
70cm
2
70cm
2
40cm
2
28cm
2
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The total surface area for this rectangular prism is
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