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

Radius = 70 m

So, perimeter of inside circle = $=2\pi r=2*\frac{22}{7}*70=440m$

width of the path =7m

So radius of the outer circle = 70+7=77m

So, the perimeter of the outside circle$=2\pi r=2*\frac{22}{7}*77=484m$

Total perimeter= 440+484=924 m

Cost of fencing per meter =Rs. 7

Cost of fencing for 924 m = 924*7=Rs. 6468

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