Question

the ratio between the length and breadth of a rectangular field is 1 :3 .its area is 3/4 hectares.what iss the perimeter of the feild ?
(a)1000m
(b)4000m
(c)400m
(d)20000m

Answer 1

Let the sides be 1k and 3k.
Given, area = 3/4 hectares
                    = $\frac{3}{4} * 10000$m^{2}
                    = 7500 m^{2}

L*B= 7500
1k*3k= 7500
3k^{2}=7500
k^{2}=2500
k= 50.
Therefore,
l= 3*50= 150m
b=1*50=50m

Perimeter= 2(l+b)
               = 2(150+50)
               = 2 (200)
                = 400m
Hope it helped! Do check my calculations.
NISHTHA.

Answer 2

hey friend here is your answer.