31. The radius of a roller is 21 cm and its length is 1.2 m. It takes 500 complete revolutions to
move once over to level a playground. Find the area of the playground in m²
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Answer:
79200m^2
Step-by-step explanation:
ROLLER IS ALWAYS IN A FORM OF CYLINDER
RADIUS=21CM
AREA OF ROLLER =CSA OF CYLINDER=
2 pie*r*h
=2*22/7*21*1.2=158.4m
area of 500 revolutions=500*158.4=79200m^2
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