Dictionary.com
definitions

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.

RELATED CONTENT

Five English Words Without A Rhyme
Read more in this article about some frequently asked questions and fun facts related to our definitions.
READ MORE
SOHCAHTOA
Read more in this article about some frequently asked questions and fun facts related to our definitions.
READ MORE

Origin of exterior angle

First recorded in 1885–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for exterior angle

exterior angle

noun

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
Science definitions for exterior angle

exterior angle

[ĭk-stîr′ē-ər]

The angle formed between a side of a polygon and an extended adjacent side. Compare interior angle.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.