2. Example Problems II

A triangular park $ABC$ has sides $120m$, $80m$ and $50m$ (see Fig.). A gardener Dhania has to put a fence all around it and also plant grass inside. How much area does she need to plant? Find the cost of fencing it with barbed wire at the rate of $Rs.20$ per metre leaving a space $3m$ wide for a gate on one side.

 

 

Total cost of fencing $=Rs$