Question on: JAMB Mathematics - 2015
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
21πcm2
B
21πcm2
C
15πcm2
D
17πcm2
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Correct Option: B
The external radius = 11cm
The internal radius = 10cm
The area of cross section = π(π2 − 102)
= π (11 + 10)(11 − 10)
π(21)(1)
= 21πcm2
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