Question

The length of a rectangle is three times of its breadth. If the perimeter of rectangle is 640 m then find its area.

Answer 1

Answer:

Step-by-step explanation:

Let the breadth of the triangle be x.

Then length =3*x

Perimeter=2*(l+b)

640=2*(l+b)

3x+x=320

4x=320

x=80

Breadth=x=80m

Length=3x=240m

Area=length*breadth

=80*240

=19200m2

Answer 2

Answer:

Step-by-step explanation:

x=length. y=breadth

x=3y. (1)

2(x+y)=640. x+y=320. (2)

Multiply eqn (2) by 3

3x+3y=960. (3)

Add eqn (1)&(2)

x =240

y= 80

Area of rectangle=l×b. =240×80. =19200cm2