Question

Elijah wraps a gift box in the shape of a triangular pyramid. The figure below shows a

net for the gift box.
9.53 ft
11 ft
If all the triangles are equilateral, how much wrapping paper
did he use, in square feet?

Answer 1

Understanding how to solve...

The base of each triangle is 11 ft, and the height of it is 9 ft.

And then, there are 4 of these triangles. So, as we know, when we do the formula for finding one triangle, we do
`SA=(1)/(2) *B*H`. But if we have to do it for 2, then we will do...
`SA = B*H`, and applying that same trick, if we have to do it for 4 of them, we will do
`SA =2*B*H`

Finding answer:

B = 11

H = 9.53

`SA = 2*B*H\\=2*11*9.53\\=2*104.83\\=209.66`

Answer:

209.66ft² of wrapping paper was used