exterior-angle

exterior angle

noun Geometry.
1.
an angle formed outside parallel lines by a third line that intersects them. See diag. under interior angle.
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.

Origin:
1885–90

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
exterior angle
 
n
1.  an angle of a polygon contained between one side extended and the adjacent side
2.  any of the four angles made by a transversal that are outside the region between the two intersected lines

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
exterior angle   (ĭk-stîr'ē-ər)  Pronunciation Key 


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The angle formed between a side of a polygon and an extended adjacent side. Compare interior angle.
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