the circumference of a circular ground is 492 m find its diameter
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If the circumference is 88m, then 2×π×r=88
r=14m.
Area to be leveled =π×(r 12 –r 22 ), where r 1
=14 and r 2
=14−3m=11m
Cost =Area×7=π(r 12 −r 22 )×7= 722 ×75×7=1650 Rs.
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