Perimeter of rectangle =
Given: The perimeter of a rectangle is three times its length.
So, if length =
But we know that perimeter of a rectangle is:
Given that :width
We substitute values from (1) and (3) in (2):
( We can also say that as the left hand side of (1) and(2) are equal, equating the right hand sides we get--)
Now substitute this value of