Question

b The length of a rectangle
is twice its length and
breadth. Its perimeter
perimeter is 42 cm find
Length & breadth.​

Answer 1

Step-by-step explanation:

Let the breadth of the rectangle is b cm.

So, the length of the rectangle is 2b cm.

We know that the perimeter of rectangle is

=2(l+b)

Since, perimeter of rectangle is 120 cm.  

Therefore,

6b=120

b=20 cm

And l=40 cm

So, the area of rectangle is

=20×40=800 cm2

Hence, the length is 40 cm, breadth is 20 cm and area is 800 cm2.

Answer 2

Answer:

length =2X

breadth=X

then 2(2X+X) =42

3X =42/2

X=21/3

X=7

so breadth =7

length =2X=2*7=14