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Solution :

Given area of a circular playground = `22176m^(2)` <br> `:. pir^(2) = 22176` [`because` area of circle = `pir^(2)`] <br> `rArr (22)/(7)r^(2)= 22176 rArr r^(2) = 1008 xx 7` <br> `rArr r^(2) = 7056 rArr r = 84m` <br> `:.` Circumference of a circle = `2pir = 2xx(22)/(7) xx 84` <br> = `44 xx 12 = 528 m` <br> `:.` Cost of fencing this ground = `528 xx 50` = Rs. 26400`