Question

The sides of a rectangular park are in ratio 4:3 . If it's area is 1728 square metre, find the cost of fencing it at rupees 30 per metre

Answer 1

Answer:

4x×3x =1728

12xsquare =1728meter squar

x square=1728÷12

X square=144

X=√144

x=12

12×30

rupees 360

Answer 2

Hey there!!!

Let 4x and 3x be the dimension of the rectangular park

According to the question -

$= > 4x \times 3x \: = 1728 \\ = > {12} {x} ^{2} = 1728 \: {m}^{2} \\ = > {x}^{2} = 144 \\ = > x \: = \sqrt{144} \\ = > x = 12$

L = 4x => 4 ×12 = 48

B = 3x => 3 × 12 = 36

Perimeter = 2( l+ b)

= 2 ( 48+36)

= 168

cost = rate × perimeter

= 30 × 168

= ₹ 5040

Hope this helps u !!!