interior angle

noun

Definition of interior angle

1 : the inner of the two angles formed where two sides of a polygon come together
2 : any of the four angles formed in the area between a pair of parallel lines when a third line cuts them

Illustration of interior angle

Illustration of interior angle

agh, bgh, ghd, ghc interior angle 2

Examples of interior angle in a Sentence

Recent Examples on the Web Both are three-dimensional structures, but each has a very different geometry: Their layouts are different, the curvature of their exteriors is different, their interior angles are different. Quanta Magazine, "Mathematicians Explore Mirror Link Between Two Geometric Worlds," 9 Apr. 2018 Both are three-dimensional structures, but each has a very different geometry: Their layouts are different, the curvature of their exteriors is different, their interior angles are different. Quanta Magazine, "Mathematicians Explore Mirror Link Between Two Geometric Worlds," 9 Apr. 2018 Dehn focused on the interior angles formed where two faces of a three-dimensional shape meet. Quanta Magazine, "Mathematicians Cut Apart Shapes to Find Pieces of Equations," 31 Oct. 2019 Both are three-dimensional structures, but each has a very different geometry: Their layouts are different, the curvature of their exteriors is different, their interior angles are different. Quanta Magazine, "Mathematicians Explore Mirror Link Between Two Geometric Worlds," 9 Apr. 2018 Both are three-dimensional structures, but each has a very different geometry: Their layouts are different, the curvature of their exteriors is different, their interior angles are different. Quanta Magazine, "Mathematicians Explore Mirror Link Between Two Geometric Worlds," 9 Apr. 2018 Both are three-dimensional structures, but each has a very different geometry: Their layouts are different, the curvature of their exteriors is different, their interior angles are different. Quanta Magazine, "Mathematicians Explore Mirror Link Between Two Geometric Worlds," 9 Apr. 2018 Both are three-dimensional structures, but each has a very different geometry: Their layouts are different, the curvature of their exteriors is different, their interior angles are different. Quanta Magazine, "Mathematicians Explore Mirror Link Between Two Geometric Worlds," 9 Apr. 2018 The 180-degree total signifies flatness, according to a 19th-century formula called the Gauss-Bonnet theorem that relates the intrinsic curvature of a surface to the interior angles of a closed path around it. Quanta Magazine, "Scientists Conjure Curves From Flatness," 6 Jan. 2015

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'interior angle.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of interior angle

1756, in the meaning defined at sense 1

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The first known use of interior angle was in 1756

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Cite this Entry

“Interior angle.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/interior%20angle. Accessed 19 Oct. 2020.

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