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-- Picture the rectangular prism in your mind, or sketch it on paper.

-- Label the edges with the dimensions.

-- Notice that . . .
- The area of the top and bottom faces is (length x width), and there are two of them.
- The area of the left and right sides is (length x height), and there are two of them.
- The area of the front and back ends is (width x height), and there are two of them.
-- So the total surface area of the rectangular prism is
(2) x [ (length x width) + (length x height) + (width x height) ] .

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Q: How do you find the surface area of a rectangular prism with a length of 20 cm a width of 5 cm and a depth of 3 cm?
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