Question

A hollow cylindrical copper pipe is 210 cm long its outer and inner diameter 10 cm and 6 CM 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.