Question

What is the combined area of the left and right faces of the prism Tim

Answer 1

The area of the left and right faces are given by:

$A=bh$

for those faces the base is 9 in and the height is 4 in, then their areas area:

$A=9\cdot4=36$

The combined area is their sum, since they are equal we get 72.

Therefore the combined area is 72 squared inches.