- any of the four angles formed on the outside of two straight lines when crossed by a transversal
- an angle formed by any side of a polygon and the extension of the adjacent side
See exterior angle in American Heritage Dictionary 4
- The angle between any side of a polygon and an extended adjacent side.
- Any of the four angles that do not include a region of the space between two lines intersected by a transversal.
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Angles 1, 2, 7, and 8 are exterior angles.
Learn more about exterior angle