Question

A hollow garden roller of 42cm diameter and length 152cm is made of cast iron 2cm thick. Find the volume of iron used in the roller

Answer 1

Outer diameter is 42 cm so outer radius = 42/2 cm = 21 cm

Thickness is of 2 cm so inner radius = 21-2 = 19 cm

Length is 152 cm

Volume = pi*(21^2-19^2)*152

Volume = pi*80*152

Volume = 38201.76 cm^3

Answer 2

762431 cm square hope it is right