The area of a circular play ground is $22176$ cm$^2$. Find the cost of fencing this ground at the rate of ₹$50$ per metre.

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Step 1: Let the radius of playground be $r$ cm. $\pi r^2 = 22176$. $r = 84$ cm
Step 2: Circumference $= 2\pi r = 2 	imes \frac{22}{7} 	imes 84 = 528$ cm
Step 3: Cost of fencing $= \frac{50}{100} 	imes 528 = $ ₹$264$

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