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.
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That will depend on how many sides the polygon has.
You can find several of them in any polygon.
The interior angle of a polygon in degrees is 180*(n-2)/n, where n is the number of sides of the polygon. In radians, it is pi*(n-2)/n.
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360/exterior angle = number of sides of a regular polygon