Question

Use the net to find the surface area of the square pyramid. A) 210 in2 B) 320 in2 C) 420 in2 D) 450 in2

Answer 1

D. 420

The area of a triangle is

`(1)/(2) bh`

half of(base× height)

10×16= 160

160÷2=80

That is the surface area of ONE triangle.

multiply 80 by 4 to get 320

then find the surface area of the square by doing length×width to get 100

Finally add them together

320+100=420