Question

(iv)Cost of fencing the park is

(a)Rs4940 (b)Rs2500 (c)Rs5000 (d)noneoftheabove​

Answer 1

Answer:

Rs.4940

Step-by-step explanation:

here, a=120m,

b=80m,

c=50m

and,

$s = \frac{a + b + c}{2} = \frac{250}{2} = 125$

Area she need to plant grass =

$\sqrt{s(s - a)(s - b)(s - c)}$

$= \sqrt{125(125 - 120)(125 - 80)(1250 - 50)}$

$= 375 \sqrt{15 } {m}^{2}$

cost of fencing =[(a+b+c)−3].20

=[250−3].20

=Rs4940