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Help and explain

I have been here for a month and going back to the video and not understand

Help and explain I have been here for a month and going back to the video and not-example-1
User Varesa
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Answer:

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

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 * 12\,in + 2* 5\,in * 12\,in + 2* 20\,in * 5\,in + 2* 20\,in * 11\,in + 2* (1)/(2)* 12\,in * 9\,in


A_(T) = 1108\,in^(2)

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

User Dominican
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