\"\"

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The side lengths of a right triangle are \"\" ; \"c

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Apply Pythagorean theorem: \"a

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\"\"              (Substitute 15 for a and 36 for b)

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\"\"          (Evaluate powers: \"\")

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\"\"                    (Add: \"400)

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\"\"             (Take square root each side)

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\"\"                (Write \"\")

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\"\"                          (Cancel sqaure and root)\"\"

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The unknown length of \"\".