\"\"

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Given that AC = 9 and BC = 12.

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Use the Pythagorean Theorem for right triangle ACB to solve for AB.

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\"\"              (Pythagorean theorem)

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\"\"                 (Substitute \"\")

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\"\"                       (Evaluate powers)

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\"\"                               (Add: \"\")

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\"\"                                      (Taking out square root)\"\"

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The value of AB is 15.