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The area of a circular playground is

   

   

. Find the cost of fencing this ground at the rate of Rs

   

per metre.
contexto.140

From the given question,

We got Area of the circular playground =

   

   

Let us consider r as the radius of the circle.

Therefore,

   

⇒ 

   

⇒ 

   

⇒ 

   

⇒ 

   

∴ we got Radius of the circular playground as

   

m

Now, we know that circumference of the circle =

   

=

   

=

   

m

Cost of fencing one meter of ground = Rs

   

∴ Cost of fencing the total ground for Rs

   

Per mete = Rs

   

= Rs