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September 20, 2014

September 20, 2014

Posted by **Cara** on Thursday, January 14, 2010 at 11:50pm.

- Geometry -
**drwls**, Friday, January 15, 2010 at 12:13amThe total surface area of a rectangular prism is

2(ab + ac + bc)

where a, b and c are the three side lengths.

It would be 2(70 + 30 + 21) = 242 ft^2 for the figure you describe.

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