19. A road roller takes 750 complete revolutions to move 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 1 m.
Answers
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Step-by-step explanation:
⇒D=84 cm,l=1m
⇒r=42cm
⇒Area of road covered in 1 revolution =2πrl =2×
7
22
×42×1=
100
264
sq m
⇒Area of road covered in 750 revolution = 750×(
100
264
) =1980 sq m
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