What is the are of an equilateral triangle of side 18 cm?\nOptions:\n(A) 66âˆš3 cm2\n(B) 74âˆš3 cm2\n(C) 81âˆš3 cm2\n(D) 64âˆš5 cm2\n(E) 14âˆš3 cm2 Hmmm, my stream of consciousness:
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Area of an equilateral triangle = âˆš3/4 S2\nIf S = 18, Area of triangle = âˆš3/4 * 18 * 18 = 81âˆš3 cm2; So, the answer is (C).
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