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23 August, 23:23

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

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  1. 24 August, 01:33
    0
    TSA of square pyramid = a (2l+a)

    = 10 (2*9+10)

    = 10 (18+10)

    = 10*28

    = 280 in2
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