Mensurationhard · Past Paper
Find the surface area of a sphere whose volume is 4.5π cubic cm.
A9π cm²
B4.5π cm²
C12π cm²
D6π cm²
✓ Correct Answer: A — 9π cm²
V = 4/3 πr³ = 4.5π => r³ = 4.5 * 3 / 4 = 13.5/4 = 3.375 => r = 1.5. Area = 4π(1.5)² = 4π * 2.25 = 9π cm².
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