Answer:
'm guessing you mean with parallels and a transversal. If this is the case, then find he angle that is either
a; supplementary (creating a flat angle, 180 degrees) or
b; complimentary (creating a 90 degree angle)
Explanation:
subtract the supplementary/complimentary angle from either 180 or 90 and the difference is your answer. Hope I helped!
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More likely the question is concerned with the interior angles of a polygon. If the polygon is irregular then there is no simple answer. An interior angle can have any value.
However, if it is a regular polygon then the question can be answered. The sum of all the exterior angles is 360 degrees - irrespective of the number of sides (or vertices). Suppose the polygon has n sides/vertices.
Then, since it is regular, each exterior angle is 360/n. Therefore, each interior angle is 180-360/n degrees.