Give a quick stream of consciousness before answering the following question. The edge of a cube is 3a cm. Find its surface?
Options:
(A) 24a8
(B) 24a4
(C) 24a1
(D) 54a2
(E) 24a7
6a2 = 6 * 3a * 3a = 54a2
The answer: (D).