SOLUTION: the inner circumference of track is 220 meter. the track is 7 meter wide everywhere. calculate the cost of putting up fence along the outer circle at the rate of rupees 2 per meter

Question 820323: the inner circumference of track is 220 meter. the track is 7 meter wide everywhere. calculate the cost of putting up fence along the outer circle at the rate of rupees 2 per meter.
Answer by LinnW(1048) (Show Source): You can put this solution on YOUR website!
Steps to solve.
1) Find the radius r of the inner circle.
2) Find the radius R of the outer circle.
3) Find a formula for the outer circumference O .
4) Multiply O to give us the amount in rupees.
1) Use the formula for circumference C = (pi)(2r)
C = (pi)(2r)
divide each side by (pi)
C/(pi) = 2r
divide each side by 2
C/(2(pi)) = r
2) R, the outer radius = r + 7 = C/(2(pi)) + 7
3) O, the outer circumference = (pi)*(2R) =
or , where 220 is the inner circumference.
4) Multiply by 2 to give us the number of rupees
=
=
=
=
, the number of rupees
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