Question

The perimeter of a rectangle is $20$ units. If the length of one side is $6$ units, what is the length of the other side?

Answer 1

So, we have a rectangle with perimeter of $20$ cm and length of $6$ cm.



We know that, for a rectangle the opposite sides are equal and the perimeter is equal to sum of all sides.

Now, if the height is h,

$6+6+h+h=20$
$12+2h=20$
$12+2h-12=20-12$
$2h=8$
$\frac{2h}{2}=\frac{8}{2}$
$h=4$

So, the height or the length of the other side of the rectangle, would be $4$ cm.

We can check this for ourselves:

If the length is $6$ cm and the height is $4$ cm, the perimeter would be $=6+6+4+4+4=20$ cm