NCERT Class 8 Mathematics Solutions: Chapter 11 – Mensuration Exercise 11.3 Part 5 (For CBSE, ICSE, IAS, NET, NRA 2022)

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1. The lateral surface area of a hollow cylinder is . It is cut along its height and formed a rectangular sheet of width . Find the perimeter of rectangular sheet?



Lateral surface area of hollow cylinder

Height of hollow cylinder

Curved surface area of hollow cylinder


Length of rectangular sheet

So, the perimeter of rectangular sheet is .

2. A road roller takes complete revolutions to move once over to level a road. Find the area of the road if the diameter of a road roller is and length .

A Road Roller Takes 750 Complete Revolutions to Move Once Ov …



Diameter of road roller

Radius of road roller

Length of road roller

Curved surface area of road roller

Area covered by road roller in revolutions


So, the area of the road is .