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
-
A.
440(pi)cm3 -
B.
1100(pi)cm3 -
C.
4400(pi)cm3 -
D.
1100(pi)cm3
Correct Answer: Option A
Explanation
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)