# The diameter of a circular park is 140m . around it on the outside , a path having the width of 7m is constructed . if the path has to be fenced from inside and outside the rate of Rs7 per metre , find its total cost . (please use the formula of pi and plese solve the answer in properway dont only give answer) .

The dimeter of inside circle = 140m
So, perimeter of inside circle = $=2\pi r=2*\frac{22}{7}*70=440m$
So, the perimeter of the outside circle$=2\pi r=2*\frac{22}{7}*77=484m$