1.

The cost of fencing a circular field at the rate of Rs.24 per metre is Rs. 5280. Find the radius of the field.

Answer»

Length of the fence 

\(\frac{Total\,cost}{Rate}\)

= \(\frac{Rs.5280}{Rs.24/metre}\) = 220 m 

So, length of fence = Circumference of the field 

∴ 220m = 2πr = 2 x \(\frac{22}{7}\) x r 

So, r = \(\frac{220\times7}{2\times22}\) m = 35 m



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