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.
A. 153\(\pi\)cm3 B. 207\(\pi\)cm3 C. 15 300\(\pi\)cm3 D. 20 700\(\pi\)cm3
Correct Answer: D
Explanation
Volume of a cylinder = πr\(^2\)h 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\(^3\)
