Let the legs of the triangle be 3x and 4x, and the hypotenuse is 25 cm. By Pythagoras’ theorem: (3x)² + (4x)² = 25² 9x² + 16x² = 625 25x² = 625 x² = 25 x = 5. Therefore, the lengths of the legs are 3x = 15 cm and 4x = 20 cm. The perimeter of the triangle = 15 + 20 + 25 = 60 cm.
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