8. Four mark example problems II

A farmer wants to fence his circular poultry farm with barbed wire whose radius is \(420 \ m\). The cost of fencing is \(₹12\) per metre. He has \(₹30,000\) with him. How much more amount will be needed to fence his farm? (Here \(\pi = \frac{22}{7}\))

 

Answer:

 

Length of the barbed wire \(=\)  \(m\)

 

Cost of fencing the poultry farm \(= ₹\)

 

Excess amount required \(= ₹\)