# RD Sharma Solutions Class 8 Mathematics Solutions for Surface Area and Volume of Right Circular Cylinder Exercise 22.2 in Chapter 22 - Surface Area and Volume of Right Circular Cylinder

Question 41 Surface Area and Volume of Right Circular Cylinder Exercise 22.2

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.

We have,

Width of roller = 63 cm

Thickness of roller = 4 cm

Girth (perimeter) = 440 cm 2πR = 440

2 × 22/7 × R = 440 R = 440×7 / 2×22

= 70cm

Inner radius = R - thickness = 70 - 4 = 66 cm

Volume of cylindrical iron = π(R2 – r2) l

= 22/7 × (702 - 662) × 63

= 22/7 × 594 × 63

= 107712 cm3

∴ The volume of iron is 107712cm3

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