# exterior angle

(redirected from exterior angles)
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exterior angle
Angles 1, 2, 7, and 8 are exterior angles.

## exterior angle

n.
1. The angle between any side of a polygon and an extended adjacent side.
2. Any of the four angles that do not include a region of the space between two lines intersected by a transversal.

## exterior angle

n
1. (Mathematics) an angle of a polygon contained between one side extended and the adjacent side
2. (Mathematics) any of the four angles made by a transversal that are outside the region between the two intersected lines
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

## exte′rior an′gle

n.
1. an angle formed outside parallel lines by a third line that intersects them.
2. an angle formed outside a polygon by one side and an extension of an adjacent side; the supplement of an interior angle of the polygon.
[1885–90]
exterior angles
Angles 1, 2, 7, and 8 are exterior angles. Angles 1 and 8 and angles 2 and 7 are alternate exterior angles.

## ex·te·ri·or angle

(ĭk-stîr′ē-ər)
The angle formed between a side of a polygon and an extended adjacent side. Compare interior angle.