Question

Mandy needs to paint all the faces and the base of a model pyramid she made for her history project. The dimensions of the pyramid are shown here. What is the total surface area of the pyramid?
A square pyramid is shown. The side of the square is 10 inches. The height of the triangular faces is 9 inches.

A. 190 in2
B. 280 in2
C. 380 in2
D. 460 in2

Answer 1

Hello,

The correct answer is B) 280 in²

= 10( 2 × 9 + 10 )

= 10 (2 × 9 = 18 + 10 = 28)

= 10 × 28 = 280

= 280

Answer: 280 in²

In other words.....

= 10(2*9+10)

= 10(18+10)

= 10*28

= 280

Answer: 280 in²

Hope this helps!!!! (: