a rode roler take takes 750 revolution to move once over to lable the road are of the road if radius of the road rolar is 42 cm and length is 1m.
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Step-by-step explanation:
Given,
the Radius of road roller (r) = 42 cm or 42/100 m
the length of road roller (l) = 1 m
given,
the roller takes 750 revolution to level the whole road = 750 × Area covered in one revolution
= 750 × lateral surface area of cylinder
= 750× 2πrh
= 750 × 2× 22/7× 42/100×1
= 1500 × 44/7×42/100
= 15 ×44 ×6
= 660 ×6
= 3960 m square
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