Question

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
meter leaving a space 3m
wide for a gate on one
side.​

Answer 1

Step-by-step explanation:

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