The diameter of a circular park is 140 m. Around it on the outside, a path having thewidth of 7 m is constructed. If the path has to be fenced from inside and outside at therate of 7 7 per metre, find its total cost.

The diameter of a circular park is 140 m. Around it on the outside, a

1.	The diameter of a circular park is 140 m. Around it on the outside, a path having thewidth of 7 m is constructed. If the path has to be fenced from inside and outside at therate of 7 7 per metre, find its total cost.
Answer» We have to find the inside distance and outside distance.for inside distance , radius = 140/2 =70 mlength of circumference =2π×radius =2×(22/7)×70 =440 mnow, outside distanceradius = 70 +7 = 77 mlength of circumference = 2π× radius = 2×(22/7)×77 = 484 mtotal length = 440 +484 =924 mcost = Rs 7× 924 = Rs 6468