Interior Angle Definition & Meaning

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    • interior angle American

    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.

    interior angle British

    noun

    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" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 interior angle Scientific / ĭn-tîr′ē-ər /

    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.

    3. Compare exterior angle

    Etymology

    Origin of interior angle

    First recorded in 1750–60

    Example Sentences

    Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

    We learn that the interior angles of triangles add up to 180°.

    From Scientific American

    I got the first cut, but again, when I started cutting the interior angle, the bar worked its way out of the jig, and the tool dug in and broke.

    From Literature

    I think this is fascinating because it means that in other geometries, there are triangles that have different sums of interior angles!

    From Scientific American

    Each interior angle of a regular heptagon is a bit over 128 degrees, so when we put three of them together at a vertex, we get more than 360 degrees.

    From Scientific American

    Squinch, skwinch, n. a small stone arch, or series of arches, across an interior angle of a square tower to support the sides of an octagonal spire.

    From Project Gutenberg

    Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

    Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

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