A cylindrical metal pipe 1m long has an outer diameter of 7.2cm and an inner diameter of 2.8cm. Find the volume of metal used for the cylinder
440\(\pi\)cm3
1100\(\pi\)cm3
4400\(\pi\)cm3
1100\(\pi\)cm3
Correct answer is A
Volume of cylinder pip (V) = \(\pi\)h(R\(^2\) - r\(^2\))
= 100\(\pi\)(7.2\(^2\) - 2.8\(^2\))
= 100\(\pi\)(51.84 - 7.84)
= 100\(\pi\) x 44
= 440\(\pi\)cm\(^3\)