What is the are of an equilateral triangle of side 16 cm?
Options:
(A) 645
(B) 649
(C) 443
(D) 643
(E) 143 Stream of consciousness first, then make a decision:
Area of an equilateral triangle = 3/4 S2
If S = 16, Area of triangle = 3/4 * 16 * 16 = 643 cm2;
Thus, the answer is (D).