Respuesta :
So,the length of rectangle is 24 cm
The breadth of rectangle is 18 cm
please see the attached picture for full solution
Hope it helps
Good luck on your assignment

you can use x present the length
the breadth is x-6
so,2(x+x-6)=84
you can solve x=20.5
the breadth is 14.5
length is 20.5
the breadth is x-6
so,2(x+x-6)=84
you can solve x=20.5
the breadth is 14.5
length is 20.5