Question

Help and explain

Answer 1

Answer:

The surface area of the composite figure is 1108 square inches.

Step-by-step explanation:

The surface area of the composite figure ($A_{T}$) is equal to the sum of external faces of the rectangular and triangular prisms, all measured in square inches:

$A_{T} = 20\,in \times 12\,in + 2\times 5\,in \times 12\,in + 2\times 20\,in \times 5\,in + 2\times 20\,in \times 11\,in + 2\times \frac{1}{2}\times 12\,in \times 9\,in$

$A_{T} = 1108\,in^{2}$

The surface area of the composite figure is 1108 square inches.