Question

Which expression can be used to find the surface area of the following square pyramid? 8 10 Choose 1 answer: А 100 + 80 + 80 + 80 + 80 B 10 + 10 + 8 + 8 + 8 + 8 100 + 80 D 100 + 40 + 40 + 40 + 40 Report a problem Stuck? Watch a video or use a hint.

Answer 1

i can imagine that 8 is the heigh of the triangles and that 10 is the lenght of each side of the base:

then a expression to calculate the surface area is:

area of the base+ area of each triangle+area of each triangle+area of each triangle+area of each triangle= total surface area

the the total surface area is

$10(10)+\frac{10(8)}{2}+\frac{10(8)}{2}+\frac{10(8)}{2}+\frac{10(8)}{2}=100+40+40+40+40$

so the answer is D