Question 11022: What is the interior degrees of a 20-gon?
Answer by longjonsilver(2297)   (Show Source):
You can put this solution on YOUR website! well, a 20-sided polygon can be split into 18 triangles.
so, 18 triangles have a total of 18*180 --> 3240degrees.
Now, as the polygon is regular ie all angles are the same, there are 20 of them, so each angle is 3240/20 --> 162.
I am not sure what you want, so you have 2 answers:
1. sum of interior angles = 3240
2. each angle = 162
jon.
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