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Find the area of an equilateral triangle whose perimeter is the same as that of a square whose area is 81 sq. cm

Mathematics
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can you find the perimeter of the square ?
\[\sqrt{3}a^2/4\]
Use this formula to find the area of equal triangle

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Other answers:

a = Side
If the area of the square is 81, then a side of the square is 9. The perimeter of the square is 4*9 = 36. The equilateral triangle would have side length of 12. |dw:1347692722838:dw| The area of the equilateral triangle is 1/2 b times height. The height is found by using the 30-60-90 theorem. You can also use the specialty theorem for the area of an equilateral triangle. That is the square of a side times the square root of 3 all divided by 4.
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