how to find number of sides of an irregular polygon? An irregular polygon has one angle 126 degrees and the rest 162 degrees. how many sides are there in this irregular polygon?

I have tried to find our the sides with the formula of a regular polygon; obviously it doesn't work.
Using the formula of the sum of interior angles 

$$162(n-1) + 126 = 180(n-2) \Rightarrow n=18. $$

Remark: I assume a simple and plane polygon.
try this: do the average of 162 and 126. So that would equal 144. Then subtract 180- 144 and you will get 36. Then divide 36 by 360 and get 10. Therefore your polygon has 10 sides.