That will depend on how many sides the polygon has.
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You can find several of them in any polygon.
If you are trying to find the missing angle of a triangle you do 180 degrees minus your two other angles. However if you are trying to find the missing angle of a quadrilaterals you do the same thing but with 360 degrees.
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.
Subtract the two known angles from 180 degrees will give you the missing angle
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