They are angles that lie on the same side of the transversal outside the lines named.
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The sum of the exterior angles of a n-gon is 360 degrees, whatever the vaue of n. If the polygon is regular, these exterior angles have the same measure, so each is 360/n degrees. So a regular pentagon has exterior angles of 360/5 = 72 degrees.
Interior angles are 180 degrees Exterior angles are 360 degrees
The sum of the exterior angles of any polygon is 360 degrees.
The question can be answered only if the 20-gon is regular - ie all its angles are the same. IF that is the case, then: The sum of the exterior angles of any polygon is 360 degrees. Since there are 20 exterior angles, each of them must be 360/20 = 18 degrees.
360 degrees. The sum of the measures of the exterior angles of any polygon is 360°.