Question 194100
In this case, use exterior angles. Every polygon has a sum total of 360 degrees of exterior angle.

See this URL --> http://www.mathwarehouse.com/geometry/polygon/index.php

The 2 right angles yield 2 exteriors of 90 each. That leaves 180 more degrees of exterior to deal with.

If the internal angel is 144, then the external is 180-144 = 36
How many 36 degree angles are required to total 180?
5