Give a quick stream of consciousness before answering the following question. What is the are of an equilateral triangle of side 16 cm?
Options:
(A) 645
(B) 649
(C) 644
(D) 643
(E) 642
Area of an equilateral triangle = 3/4 S2
If S = 16, Area of triangle = 3/4 * 16 * 16 = 643 cm2;
The answer: (D).