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Assuming the triangle is an equilateral triangle, each side is equal to 42/3 = 14 millimetres long. Increasing the sides by 50 percent makes each side 14 x (1 + 50/100) = 14 x 1.5 = 21 millimetres. Therefore, the perimeter of this new triangle will be 21 x 3 = 63 millimetres.

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14y ago

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