\"\"

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The lengths of a right triangle are \"\".

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To find: hypotenuse c.

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Apply Pythagorean theorem: \"a

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\"\"           (Substitute 15 for a and 20 for b)

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\"\"          (Evaluate powers: \"\")\"\"

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\"\"                    (Add: \"\")

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\"\"             (Take square root to each side)

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\"\"              (Write \"\")

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

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The length of the hypotenuse is \"\".