exterior angle

noun

Definition of exterior angle

1 : the angle between a side of a polygon and an extended adjacent side
2 : an angle formed by a transversal as it cuts one of two lines and situated on the outside of the line

Illustration of exterior angle

Illustration of exterior angle

ega, egb, fhc, fhd exterior angle 2

Examples of exterior angle in a Sentence

Recent Examples on the Web It is known that the sum of the exterior angles of a convex polygon is always 360º. Since an exterior angle of a right angle is also a right angle, our four right angles would take up the entire 360º of the octagon’s exterior-angle measure. Quanta Magazine, 18 Nov. 2020

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

First Known Use of exterior angle

1756, in the meaning defined at sense 1

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Time Traveler for exterior angle

Time Traveler

The first known use of exterior angle was in 1756

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Cite this Entry

“Exterior angle.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/exterior%20angle. Accessed 24 Jun. 2021.

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