Question

The difference between the outer and inner curved surface areas of a hollow right circular cylinder 14cm long is 88cm² . If the volume of metal used in making cylinder is  176cm³ find outer and inner diameters of the cylinder?

Answer 1

Given height of a hollow cylinder = 14cm 

Let internal and external radii of hollow

Cylinder be ‘r’ an ‘R’

Given that difference between inner and outer curved surface = 88cm²

By using (1) and (2) equations and solving we get

External radii of hollow cylinder (R) =2.5cm

Internal radii of hollow cylinder (r) =1.5cm