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HINT=FIRST OF ALL FIND THE CURVED SURFACE area of the roller and then multiply it by 500 to get the area of the ground.
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Solution :
r=42cm
l=120cm
Area rolled in one revolution=2πrl
=2⋅227⋅42⋅120
=31680cm2
Area of playground=500*31680cm2
=1584⋅104cm2
=1584m2.
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