\"\"

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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 12.8 for a and 13.9 for b)

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\"\"      (Evaluate powers: \"\")\"\"

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\"\"                      (Add: \"\")

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\"\"               (Apply square root on 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 \"\".