Question on: JAMB Mathematics - 2024
A pipe made of metal 10cm thick has an external radius of 11cm. Find the area of metal in making 2.4cm of pipe.
A
21Ï€cm2
B
70Ï€cm2
C
15Ï€cm2
D
17Ï€cm2
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Correct Option: A
The external radius is 11 cm and the thickness of the metal is 10 cm. Hence, the internal radius is 11 - 10 = 1 cm. The surface area of the metal is:
Surface area = 2Ï€ x (external radius + internal radius) x height
Substituting values gives the area as 21π cm².
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