What is the are of an equilateral triangle of side 10 cm?  Choices
A) 66âˆš3 cm2
B) 25âˆš3 cm2
C) 64âˆš3 cm2
D) 64âˆš5 cm2
E) 14âˆš3 cm2
Area of an equilateral triangle = âˆš3/4 S2   If S = 10, Area of triangle = âˆš3/4 * 10 * 10 = 25âˆš3 cm2;   Answer:25âˆš3 cm2
<result>B</result>
What is the are of an equilateral triangle of side 10 cm?