Question

The radius of a circular park is 52m. On it's outside, there is a path 4m wide, running around it. Find the area of the path. Also find the cost of gravelling the path at Rs. 20 per m2?

Answer 1

the radius of the bigger circle= 52+4=56
area of the path
= 22/7 (56^2-52^2)
=1357.71 sq m
cost of paving = 1357.71x 20 = 27154.2

Answer 2

radius of park+ outside path =52+4=56 m
therefore area is..... πr².
22/7×56×56= 9856metre sq
now only circular path area= πr²=)22/7 ×52×52= 8498.28=8498mtr sqr

now total area of only path =) 9856-8498=1358mt sqr

now cost =) 1358×20= 27160rs