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the length of each side of a square prism is ten find the total surface area of the object

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Joseph S. | SAT/ACT/GED, Algebra 1, Excel, Word, PowerPoint, Writing, ProofingSAT/ACT/GED, Algebra 1, Excel, Word, Pow...
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Each side is 10x10, so each side is 100 square-units.  We then multiply the number of surfaces by 100.  If the prism is a cube, then it has 6 sides.

6*100 square-units is 600 square-units.