\"\"

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

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Apply Pythagorean theorem: \"a

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\"\"                          (Substitute 27 for a and 40 for c)

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

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\"\" (Subtract 729 from each side)

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\"\"                                   (Subtract: \"\")

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\"\"                            (Take square root each side)

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\"\"                                 (Cancel square and root)\"\"

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The unknown length of \"\".