Asked by prashita

the outer edge of a circular track is 440 m long.if is widened by 5m all around,find the cost of widening it at rate of 8 rs per m square?
Answered by Damon
2 pi Rin = 440
Rin = 70
Rout = 75

A = pi Rout^2 - pi Rin^2
= 2278 m^2

2278 * 8 = 18221
Answered by Anonymous
18212 answer
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