A pipe made of metal 10cm thick has an external radius of 11cm. find the area of metal in making 2.4cm of pipe
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Correct Answer: Option B
Explanation:
The external radius = 11cm
The internal radius = 10cm
The area of cross section = π(112 − 102)
= π (11 + 10)(11 − 10)
π(21)(1)
= 21πcm2
The external radius = 11cm
The internal radius = 10cm
The area of cross section = π(112 − 102)
= π (11 + 10)(11 − 10)
π(21)(1)
= 21πcm2