Mensurationmedium · Past Paper
A right circular cone is 3.6 cm high and its base radius is 1.6 cm. It is melted and recast into a right circular cone with base radius 1.2 cm. Find its height.
A6.4 cm
B4.8 cm
C3.2 cm
D9.6 cm
✓ Correct Answer: A — 6.4 cm
(1/3)π(1.6)²(3.6) = (1/3)π(1.2)²(H). (2.56)(3.6) = (1.44)H. H = 9.216 / 1.44 = 6.4 cm.
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