What is the corollary to the polygon angle sum theorem?

Theorem 6.2 POLYGON EXTERIOR ANGLES THEOREM - The sum of the measures of the exterior angles, one from each vertex, of a CONVEX polygon is 360 degrees. The Corollary to Theorem 6.2 - the measure of each exterior angle of a regular n-gon

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.