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2016-03-16T21:29:43+05:30

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ATQ, 2*22/7*r=440
or,r=70m. d=140m.
outer d=140+.14=140.14
area of inner circle=22/7*r^2=15400 sq.m and area of outer circle=πr^2=15909.54sq.m
area of the path=15909.54-15400=509.54sq.m*20=rs.1019.8
circum. of outer circle=2πr=440.44
costing=440.44*2=rs.880.88
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