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exterior angle

noun, Geometry
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.
Origin
1885-1890
1885-90
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for exterior-angle

exterior angle

noun
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 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
  (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 © 2002. Published by Houghton Mifflin. All rights reserved.
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15
15
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