Question

the length of an aluminium wire is 64 cm it is bent into a rectangle of area 240 square centimetre find the length and breadth of a rectangle formed

Answer 1

Answer:

Hey Mate, Answer is here

Step-by-step explanation:

Please see

Just substitute 20 with 240, mark as brainiest

Answer 2

Answer:

length and breadth are 12 cm and 20 cm.

Step-by-step explanation:

Let length and breadth of the rectangle be "$l$","$b$" respectively.

Now, 2($l+b$)=64

    => $l+b$ = 32   =>  $b$ = 32 - $l$       ---------------------------(1)

And area = $lb$ = 240   ---------------------(2)

Put (1) in (2) , we get

=> $32l-l^{2} =240$

=> $l^{2}-32l+240 =0$

=> $l=\frac{32+\sqrt{1024-960} }{2} (or)\frac{32-\sqrt{1024-960} }{ 2}$

=> $l= 20(or)12$

Now,    $b=32 - l=32 -20 (or)32-12$

      =>$b= 12 (or)20$