alleryA hollow cylindrical pipe has outer radius 4 cm, inner radius 3 cm and height 10 cm. The volume of the material is
A100 pi cu cm
B50 pi cu cm
C90 pi cu cm
D70 pi cu cm
Answer & Solution
Correct answer: D. 70 pi cu cm
1. Material volume = pi × h × (R squared - r squared) = pi × 10 × (16 - 9).
2. = pi × 10 × 7.
3. = 70 pi cu cm.
_Source: syllabus Mathematics, Ch 12 "Surface Areas and Volumes", §12.2_
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