The diameter of a garden roller is 4m and it is 2m long. How much area will it cover in 5 revolutions ?

  1. 32 m²
  2. 22 m²
  3. 12 m²
  4. 44 m²
Anurag Mishra Professor Asked on 26th January 2016 in Maths.
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1 Answer(s)

Answer: (4) 44 cm^2

Solution:-
Given-

The diameter = 1.4 m
Radius = 1/2 of diameter. = 1.4 / 2 = 0.7 m
Length of the garden = 2 m

Surface area of the circle =  2 x pie x r x l
                                     = 2 x 22/7 x 0.7 x 2 = 8.8 m²
Revolution = 5
So,  total area  covered in 5 revolution = 5 x 8.8 = 44 m²

Hence, the correct answer is option (4) 44 cm^2

Anurag Mishra Professor Answered on 26th January 2016.
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