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Four equilateral triangles are descri...

Four equilateral triangles are described on the four sides of a rectangle with perimeter 12 cm. If the sum of the areas of the four triangles is `10sqrt(3)\ c m^2` , what is the area of the rectangle? (a) 5 cm2 (b) 8 cm2 (c) 9 cm2 (d) 6.75 cm2

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