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Question

The diameter of a garden roller is 1.4 m and it its 2 m long. How much area will it cover in one revolution?
  1. 6.8 m2
  2. 8.8 m2
  3. 3.8 m2
  4. 5.8 m2

A
6.8 m2
B
8.8 m2
C
5.8 m2
D
3.8 m2
Solution
Verified by Toppr

Diameter of the roller (d)=1.4m.

Radius of the roller (r)=1.42=0.7m.

Length of the roller (h)=2m.

If the roller complete one revolution

Then the area covered = Curved surface area of the roller =2πrh

Area covered in 1 revolution =2πrh

=2×227×0.7×2
=88×0.1
=8.8m2

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