Question

A hollow garden roller, 63 cm wide with a girth of 440 cm, is made of 4 cm thick iron. Find the volume of the iron used. ​

Answer 1

hey mate!

Circumference of girth of roller = 440 cm

2*Pi*R = 440 = R (220*7/22) = 70 cm

Outer radius = 70 cm & inner radius = 70-4 cm = 66 cm

Therefore Volume or iron = Pi [(70^2 - 60^2)]*63

= 58752 cm^3