Question

the diameter of a circular park is 140 m. around it on the outside, a path having the width of 7 metre is constructed. if the path has to be fenced from inside and outside at the the rate of rupees 7 per metre, find its total cost.​

Answer 1

Step-by-step explanation:

We have to find the inside distance and outside distance.

for inside distance , radius = 140/2 =70 m

length of circumference =2π×radius

                                       =2×(22/7)×70

                                       =440 m

now, outside distance 

radius = 70 +7 = 77 m

length of circumference = 2π× radius

                                       = 2×(22/7)×77

                                       = 484 m

total length = 440 +484 =924 m

cost = Rs 7× 924 = Rs 6468