Bunuel wrote:

If an equilateral triangle has an area of \(\sqrt{243}\), then what is the perimeter of that triangle?

A) 6

B) 12

C) 18

D) 27

E) 81

Area of an equilateral triangle = \(\sqrt{3}\)/4 * a^2

\(\sqrt{3}\)/4 * a^2 = \(\sqrt{243}\) =9\(\sqrt{3}\)

a^2 = 36

a = 6

So perimeter of equilateral triangle = 6*3 = 18

Answer C

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