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an equilateral triangle has a equal perimeter of a rectangle whose length is 12 meter and whose width is 8.7 meter fined the measurement of the side of the equilateral triangle.

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per. of rectangle = 2(12+8.7) = 41.4
So the perimeter of the equilateral triangle is 41.4
making each side 41.4/3
or 13.8 m

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