exterior angle

1. The angle between any side of a polygon and an extended adjacent side.

2. Any of the four angles that do not include a region of the space between two lines intersected by a transversal.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

exterior angle

1. (Mathematics) an angle of a polygon contained between one side extended and the adjacent side

2. (Mathematics) any of the four angles made by a transversal that are outside the region between the two intersected lines

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

exte′rior an′gle

1. an angle formed outside parallel lines by a third line that intersects them.

2. an angle formed outside a polygon by one side and an extension of an adjacent side; the supplement of an interior angle of the polygon.

[1885–90]

exterior angles

Angles 1, 2, 7, and 8 are exterior angles. Angles 1 and 8 and angles 2 and 7 are alternate exterior angles.

ex·te·ri·or angle

(ĭk-stîr′ē-ər)

The angle formed between a side of a polygon and an extended adjacent side. Compare interior angle.

The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

ThesaurusAntonymsRelated WordsSynonymsLegend:

Noun

exterior angle - the supplement of an interior angle of a polygon

external angle

angle - the space between two lines or planes that intersect; the inclination of one line to another; measured in degrees or radians

hip - (architecture) the exterior angle formed by the junction of a sloping side and a sloping end of a roof

Translations

exterior angle

n (Math) → Außenwinkel m

Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007

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References in periodicals archive

The purpose here is to let students see that half of [angle]DOA is an exterior angle of the triangle and equal to [angle]OCA.

Experiencing the angle properties in a circle

###(vi)###An exterior angle of a triangle is greater in measure than###No

Alignment between Mathematics Curriculum and Textbook of Grade VIII in Punjab

The angle with any other vertex which lies on this line (for example, angle A[C.sub.1]B) will be less than angle ACB because [angle]A[C.sub.1]B < [angle]A[A.sub.1]B (the exterior angle A[A.sub.1]B of the triangle B[A.sub.1][C.sub.1] is bigger than the remote interior angle [angle]A[C.sub.1]B) and [angle]A[A.sub.1]B = [angle]ACB (inscribed angles).

Multiple solutions of a problem: find the best point of the shot

Initially, they defined it as a figure made with two half lines, but they were not satisfied with this definition because it was not clear whether the definition referred to interior angle or exterior angle (see Figure 2).

A case study on the local organization of two mathematically gifted seventh-grade students

A regular polygon has an exterior angle of 20 degrees.

Dr Maths

Photography for the marketing brochure was not simple as no exterior angle gives any clue to the wide open spaces inside.

Property: Luxury in a modern manor