A cylinder pipe, made of metal is 3cm thick.If the intern...
A cylinder pipe, made of metal is 3cm thick.If the internal radius of the pipe is 10cm.Find the volume of metal used in making 3m of the pipe.
153πcm3
207πcm3
15 300πcm3
20 700πcm3
Correct answer is D
Volume of a cylinder = πr2h
First convert 3m to cm by multiplying by 100
Volume of External cylinder = π \times 13^2 \times 300
Volume of Internal cylinder = π \times 10^2 \times 300
Hence; Volume of External cylinder - Volume of Internal cylinder
Total volume (v) = π (169 - 100) \times 300
V = π \times 69 \times 300
V = 20700πcm^3
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