Question

A cube and a square pyramid were joined to form the composite solid.

What is the total surface area of the composite solid?
792 square inches
936 square inches
1,080 square inches
1,152 square inches

Answer 1

936

Explanation:

Answer 2

we know that
total surface area of the composite solid=surface area of the pyramid+surface area of the cube

surface area of the pyramid=4*area of lateral triangle side
area of lateral triangle side=12*9/2----> 54 in²
surface area of the pyramid=4*54---> 216 in²

surface area of the cube=5*[12*12]----> 720 in²

total surface area of the composite solid=216 in²+720 in²---> 936 in²

the answer is the option
936 square inches