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Please how to find the area of pyramids in nets, please help its urgent. I have to calculate the surface area of the pyramid and that can only be done if the area is found, how to find it?

Guest May 7, 2017

#1
+4786
+4

I have never really used nets before..but I think all you have to do is pretend that the pyramid is made out of paper, and you cut along the edges and lay the paper flat on the table...so for this pyramid with a triangle base, it would look sort of like:

(This isn't a very accurate drawing!)

The surface area of the pyramid is the sum of the areas of each of these triangles,

and the area of a triangle = (1/2)(base)(height)

SA = (1/2)(8)(9) + (1/2)(6)(9) + (1/2)(10)(10.2) + (1/2)(8)(6)

SA = 36 + 27 + 51 + 24

SA = 138 square cm

hectictar  May 7, 2017
Sort:

#1
+4786
+4

I have never really used nets before..but I think all you have to do is pretend that the pyramid is made out of paper, and you cut along the edges and lay the paper flat on the table...so for this pyramid with a triangle base, it would look sort of like:

(This isn't a very accurate drawing!)

The surface area of the pyramid is the sum of the areas of each of these triangles,

and the area of a triangle = (1/2)(base)(height)

SA = (1/2)(8)(9) + (1/2)(6)(9) + (1/2)(10)(10.2) + (1/2)(8)(6)

SA = 36 + 27 + 51 + 24

SA = 138 square cm

hectictar  May 7, 2017
#2
+77173
+1

Looks pretty accurate to me, hectictar....!!!!.....I have to admit....the concept of "nets"  is foreign to me, too......but....it does seem like a good way to visualize exactly what is going on....

CPhill  May 8, 2017

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