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exterior angle

noun, Geometry.
an angle formed outside parallel lines by a third line that intersects them.
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 of exterior angle
First recorded in 1885-90 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for exterior angle

exterior angle

an angle of a polygon contained between one side extended and the adjacent side
any of the four angles made by a transversal that are outside the region between the two intersected lines
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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exterior angle in Science
exterior angle

The angle formed between a side of a polygon and an extended adjacent side. Compare interior angle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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