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 Exterior Angle:  An exterior angle of a polygon is formed when you extend a side of a polygon. Also, when a third line (a transversal) crosses two other lines, the angles formed outside the other two lines are called exterior angles. (see alternate exterior angles)

Sum of Exterior Angles: Determine the sum of the exterior angles in any polygon.

Outside Looking In: Identify the sum of the exterior angles in a triangle.

Remotely Interior: Compare exterior angles with remote interior angles.