What is the are of an equilateral triangle of side 20 cm?  Choose the correct choice from the following choices:	A) 64√5	B) 64√9	C) 64√4	D) 64√3	E) 100√3
Area of an equilateral triangle = √3/4 S2   If S = 20, Area of triangle = √3/4 * 20 * 20 = 100√3 cm2;   Answer: 100√3
<result>E</result>
What is the are of an equilateral triangle of side 20 cm?