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Let's denote the other leg as x. We know that the hypotenuse is equal to the square root of the sum of the squares of the legs. We can use the Pythagorean theorem to solve for x.
x^2 + 6^2 = 12^2
x^2 + 36 = 144
x^2 = 144 - 36
x^2 = 108
x = √108
x ≈ 10.4 ft.