The edge of a cube is 9a cm. Find its surface?\nOptions:\n(A) 153a2 cm2\n(B) 143a2 cm2\n(C) 233a2 cm2\n(D) 243a2 cm2\n(E) 253a2 cm2 Now, let's think a bit. Some random thoughts:
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6a2 = 6 * 9a * 9a = 243a2
The final answer: (D).
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