Question

A triangular park has sides 120 m, 80 m and 50 m. A gardener has to put a

fence all around it and also plant grass inside. How much area does he need

to plant ?. Find the cost of fencing it with barbed wire at the rate of Rs. 20

per meter, leaving a space of 3 m wide for a gate on one side.

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Answer 1

Answer:

here, a=120m,

b=80m,

c=50m

and, s=

2

a+b+c

=

2

250

=125

Area she need to plant grass =

s(s−a)(s−b)(s−c)

=

125(125−120)(125−80)(125−50)

=375

15

m

2

cost of fencing =[(a+b+c)−3].20

=[250−3].20

=Rs4940