Question

a road roller takes 750 revolutions to mover once over to level a road.find the area of the road if the diameter of the road roller is 84 cm and its length is 1m

Answer 1

diameter = 84 cm

radius = 42 cm

so,

Now,

C.S.A = 2πrh

= 2*22/7*42*100

= 26400 cm²

so ,

= 750 * 26400

= 19800000 cm²

I hope it helps……………

Answer 2

first we have to find the area covered by the roller in 1 revolution
= 2*22/7*42*100
= 26400 cm²
area covered in 750 revolutions 
= 26400*750
=19800000cm²
=1980m²

and, there u go ....... it's the answer...