The diameter of a roller is 84 cm and its length is 120 cm. It takes 750 complete revolutions to move once over to level a playground. Find the area of the playground.
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Step-by-step explanation:
roller is in cylindrical shape
radius = d/2=84/2=42
length=120cm
area of roller=curved surface area of cylinder
CSA of cylinder=2pi r h
=2×22/7×42×120
=31680
area of 1 revolution=31680cm^2
area of 750 revolutions=23760000cm^2
1cm=1/100m
23760000/10000
=2376cm^2
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