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Exterior angle
1. Exterior angle of a polygonThe angle formed by a side of a polygon and the extension of its adjacent side 
2. Exterior Angles of a transversalExterior angles are created where a transversal crosses two (usually parallel) lines. Each pair of these angles are outside the parallel lines, and on the same side of the transversal. Each pair of exterior angles is supplementary (add up to 180°). 
Pages referring to 'exterior-angle'Definition and properties of alternate exterior angles, showing the pairs of angles associated with a transversal
The exterior angles of a polygon and the method for calculating their values.
Definition and properties of the exterior angles of a transversal
A discussion and example of how the interior and exterior angles of a polygon are related, especially when the polygon is concave.
The definition and characteristics of the exterior angles of triangles
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