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  3. The diameter of a garden roller is 1.4m and it is 2m long . How much area will it cover in 5 revolutions ? (use pi = 22/7 .)
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The diameter of a garden roller is 1.4m and it is 2m long . How much area will it cover in 5 revolutions ? (use pi = 22/7 .)

Answers (1)
D Deependra Verma

Solution: Clearly ,   Area Coverd = Coverd surface  imes Number of revolution.

Here ,                         r=frac1.42m = 0.7m     and h=2m.

  herefore                           Curved surface = 2pi rh m^2         

                                                        =2 imes frac227 imes 0.7 imes 2 =8.8m^2

Hence , Area Covered = Curved surface  imes No. of revolutions = (8.8 imes 5)m^2= 44m^2

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