# 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.

Given,

Width of hollow cylinder = 63 cm

Girth (perimeter) = 440 cm

Let external radius of cylinder = R cm

So, 2πr = 440

= R =

= inner radius = outer radius – thickness = 70 – 4 = 66 cm

volume of iron = π( R2-r2)h =

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