# NCERT Class 8 Mathematics Solutions: Chapter 11 –Mensuration Exercise 11.3 Part 5

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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?

Answer:

Given,

Lateral surface area of hollow cylinder

Height of hollow cylinder

Curved surface area of hollow cylinder

Now,

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.

Answer:

Given,

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.