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Problem 10 - Entrance Test

A cone of height 9 cm and base radius 4 cm is melted to form a sphere. The radius of the sphere is

Correct: A

Volumes equal: (1/3)π(4²)(9) = (4/3)πr³ → 48 = 4r³ → r³=12 → r=∛12≈2.88. Closest 3 cm.