Question

A roller takes 750 complete revolutions to move once over a level of road. Find the area of road if the diameter of the roller is 84cm and length is 1m​

Answer 1

Area of the cylindrical roller = 2pie rh square.units

d = 84, r = d/2 r =84/2=42.

1m= 100cm

=> 2 x 22/7 x 42 x 100

= 1200 x 22 =26400 cm2

For 750 revolutions = 26400 x 750

=> 19800000 cm2. 1m2=10000cm2

=1980m2

Answer 2

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