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180-170 = 10 degrees and the polygon will have 36 sides
If its a regular polygon then its 147 degrees.
You measure it. An interior angle of an ordinary polygon can have any value in the range (0, 360) degrees excluding 180 degrees. There is no constraint on the size of a single angle.
158.82 degrees
An individual angle can have any size you like. The only constraint is on the sum of all 19 angles.