Question

A garden roller is 1.4m and it is 2m long.how much area it will cover in 5 revolutions

Answer 1

1.4×2=2.8×5=14.0 m square area it will cover in 5 revolutions

Answer 2

diameter of roller = 1.4 m
radius of roller = 0.7m = 7/10m
lenght of the roller = 2m 

area covered in 1 revolution = CSA of roller = 2 pi rh 
                                             = 2 x 22/7 x 7/10 x 2 
                                             = 88/10 = 8.8 m2

therfore,, area covered = CSA x No. of revolutions 
  i.e ,  area covered in 5 revolutions = 8.8 x 5 = 44 m2

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