Question

it is possible to design a rectangular park in the perimeter 80
m and area 400 m square if so find the length and breadth

Answer 1

area = l×b=4oo
perimeter=2(l+b)=80
therefore,,,l+b =40
that implies that l=40–b
therefore (40-b)b=400
=>40b–b^2=400
=>b^2–40b+400=0
=>b^2–20b–20b+400=0
=>b(b–20)–20(b-20)=0
=>(b-20)(b-20)=0
so the ans is b= 20 m
also l = 20 m
so the given rectangle is square
so you can not make a.rectangular park but you have to make a.square park