A triangular park ABC has sides 120m, 80m and 50m. A gardener Dhania h – InterviewSolution

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1.	A triangular park ABC has sides 120m, 80m and 50m. 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.
Answer» Length of fence=perimeter of Triangle-3m =50+80+120-3 =247m Cost of wire=length cost =24720 =4940Rs Herons formula area=`sqrt(s(s-a)(s-b)(s-c))` =`sqrt(125(125-120)(125-80)(125-50)` =`375sqrt15 m^2`

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