Dictionary.com

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.

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Origin of interior angle

First recorded in 1750–60

Words nearby interior angle

interim denture, Interim Standard Atmosphere, interinsurance, interionic, interior, interior angle, interior decoration, interior decorator, interior design, interior designer, interior drainage
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for interior angle

interior angle

noun

an angle of a polygon contained between two adjacent sides
any of the four angles made by a transversal that lie inside 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

Scientific definitions for interior angle

interior angle
[ ĭn-tîr′ē-ər ]

Any of the four angles formed inside two straight lines when these lines are intersected by a third straight line.
An angle formed by two adjacent sides of a polygon and included within the polygon. Compare exterior angle.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.