The Exterior Angle Theorem

Introduction If one side of a triangle is extended, an exterior angle is formed.  An exterior angle of a triangle forms a linear pair with the adjacent interior angle. The two non-adjacent interior angles to the exterior angle are called its remote interior angles. In the figure below, and are remote angles of . In the […]
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The Sum of the Exterior Angles of a Polygon

Introduction In the previous post, we have shown that the sum of the interior angles of a polygon with sides is degrees. In this post, we explore the exterior angles of a polygon. The exterior angle is formed by extending the side of the polygon as shown in the following figure. One observation about the exterior […]
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