Question

the length of a rectangle is 2 times its breadth the perimeter of the rectangle is 180 cm find the dimension of the rectangle

Answer 1

let the breath be x
so, length=2x
perimeter of rect.=180 cm
per. of rect.= 2X l+b
180=2X2x+x
180=2X3x
180=6x
30 cm=x
2x=2X30
=60 cm

Answer 2

let the breadth be b
and length be 2b
perimeter=180cm
perimeter of a rectangle=2(l+b)
=2(2b+b)=180cm =2*3b=180 3b=180/2 =3b=90 b=90/3 =30
So,breadth =30cm and length is 30*2=60cm.