interior angle

noun Geometry.
1.
an angle formed between parallel lines by a third line that intersects them.
2.
an angle formed within a polygon by two adjacent sides.

Origin:
1750–60

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
interior angle
 
n
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
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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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Example sentences
The exterior angle and the corresponding interior angle form a linear pair.
The measure of an interior angle of a regular n-sided polygon is.
Find the measure of each interior angle of a regular hexagon.
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