Mensurationmedium · Past Paper
A metal pipe has an external diameter of 4 cm and internal diameter of 3 cm. If its length is 20 cm, find the volume of metal used.
A110 cm³
B220 cm³
C70π cm³
D35π cm³
✓ Correct Answer: D — 35π cm³
R = 2, r = 1.5. Vol = π(R² - r²)L = π(4 - 2.25)20 = π(1.75)20 = 35π cm³.
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