The edge of a cube is 9a cm. Find its surface?
Options:
(A) 153a2 cm2
(B) 143a2 cm2
(C) 233a2 cm2
(D) 243a2 cm2
(E) 253a2 cm2 Think first, then make a decision. Some random thoughts:
6a2 = 6 * 9a * 9a = 243a2 So the answer is (D).