Question

A hollow cylindrical pipe is 210cm long. Its outer and inner diameters are 10cm and 6cm respectively. Find the volume of the copper used in making the pipe.

Answer 1

Solution:-

Given : Length of pipe = 210 cm
Let the outer and inner radius of the pipe be 'R' and 'r' respectively.
Outer diameter = 10 cm, then R = 10/2 = 5 cm
and, inner diameter = 6 cm, then r = 6/2 = 3 cm
The volume of he copper used in the making the pipe = π(R² - r²)h
⇒ 22/7*(5² - 3²)*210
⇒ 22/7*(25 - 9)*210
⇒ 22/7*16*210
⇒ 73920/7
Volume of the copper used = 10560 cu cm
Answer.

Answer 2

volume of the copper used = 10560cubic cm