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Exterior-angle

1. Exterior angle of a polygon

The angle formed by a side of a polygon and the extension of its adjacent side

2. Exterior Angles of a transversal

Exterior 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°).