• synonyms

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.
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Origin of interior angle

First recorded in 1750–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for interior angle

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
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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

interior angle in Science

interior angle

  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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.