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see the picture,
radius of circular park ( r) = 140/2 = 70 m
width of path ( d) = 7 m
now, radius of outside = ( r + d) = 70 + 7 = 77m
radius of inside = 70 m
now, distance of total of path = 2π{(r+d) + r}
= 2π{77+ 70} = 14π = 147*2*22/7 = 924m
hence, total cost = 924m × 7Rs/m = 6468 Rs
radius of circular park ( r) = 140/2 = 70 m
width of path ( d) = 7 m
now, radius of outside = ( r + d) = 70 + 7 = 77m
radius of inside = 70 m
now, distance of total of path = 2π{(r+d) + r}
= 2π{77+ 70} = 14π = 147*2*22/7 = 924m
hence, total cost = 924m × 7Rs/m = 6468 Rs
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