\"\"

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

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To find: side a.

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Apply Pythagorean theorem: \"a

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\"\"                    (Substitute 12 for b and 19 for c)

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

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\"\"  (Subtract 144 from each side)

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

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

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\"\"                (Write \"\")

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

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The length of the third side \"\".

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