What is the are of an equilateral triangle of side 18 cm?	Choose the correct choice:
A) 66âˆš3 cm2	B) 74âˆš3 cm2	C) 81âˆš3 cm2	D) 64âˆš5 cm2	E) 14âˆš3 cm2
Area of an equilateral triangle = âˆš3/4 S2   If S = 18, Area of triangle = âˆš3/4 * 18 * 18 = 81âˆš3 cm2;   Answer:81âˆš3 cm2
<result>C</result>
What is the are of an equilateral triangle of side 18 cm?