Question

if a rectangular park of perimeter 80 m and area 400m2,find length and breadth.

Answer 1

length=80/4=20
=√400=20
20 length
20 breadth

Answer 2

HEYA FRIEND HERE IS THE ANSWER

Length = l

Breadth = b

Perimeter = 2(L+b) = 80 

=> l+b = 40         .......... (eq 1)

Area = lb = 400 ........... (eq 2)

=> (l+b)^2=(l-b)^2 + 4lb

40^2=(l-b)^2+ 4 x 400  (From eqn 1 & 2)


l-b = 0            .................... (eq 3)

                                L+b = 40

                                L-b =    0

                               2L = 40 => L = 20
If L=20, then B=20 

Hope it helps to you.