interior angle

noun Geometry.
an angle formed between parallel lines by a third line that intersects them.
an angle formed within a polygon by two adjacent sides.

1750–60 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
interior angle
1.  an angle of a polygon contained between two adjacent sides
2.  any of the four angles made by a transversal that lie inside the region between the two intersected lines

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
interior angle   (ĭn-tîr'ē-ər)  Pronunciation Key 

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  1. Any of the four angles formed inside two straight lines when these lines are intersected by a third straight line.

  2. An angle formed by two adjacent sides of a polygon and included within the polygon. Compare exterior angle.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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