If you had an Isosceles Triangle and 2 of the angles were 72 degrees and the
other was 36 degrees you would have 2x + 2x + X = 180 degrees. This is the same
as 5x = 180 degrees. To find which one X is you do 180 divided by 5 (as that is
how many x's there are in total). The answer is 36. So one angle is 36 degrees.
You check this by doing 36 x 2 which is 72. That is what 2 of the angles are and
the other angle is 36.
So, ............................... X = 36 !!