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Question

The radius of a roller is 0.7 m and it is 2 m long How much area will it cover in 10 revolutions?
  1. 88m2
  2. 78m2
  3. 80m2
  4. 70m2

A
70m2
B
88m2
C
80m2
D
78m2
Solution
Verified by Toppr

The correct option is A 88m2
For one revolution
Curved surface area=2πrh=2×227×710
For 10 revolutions
Curved surface area=2×22×210×10=88m2'

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