alleryThe volume of a frustum of a cone with radii 6 cm and 3 cm and height 4 cm is
A36 pi cu cm
B63 pi cu cm
C84 pi cu cm
D12 pi cu cm
Answer & Solution
Correct answer: C. 84 pi cu cm
1. V = (1/3) × pi × h × (R squared + r squared + R r).
2. = (1/3) × pi × 4 × (36 + 9 + 18) = (1/3) × pi × 4 × 63.
3. = 84 pi cu cm.
_Source: syllabus Mathematics, Ch 12 "Surface Areas and Volumes", §12.4_
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