Other leg is (2 x 54) / 12 = 9 cm. Hypotenuse is √(12² + 9²) = √(144 + 81) = √225 = 15 cm. Perimeter = 12 + 9 + 15 = 36 cm.
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Other leg is (2 x 54) / 12 = 9 cm. Hypotenuse is √(12² + 9²) = √(144 + 81) = √225 = 15 cm. Perimeter = 12 + 9 + 15 = 36 cm.