### Definition of Exterior angle

1. Noun. The supplement of an interior angle of a polygon.

Exact synonyms: External Angle
Generic synonyms: Angle
Specialized synonyms: Hip

### Definition of Exterior angle

1. Noun. (context: geometry) An angle formed between one side of a polygon and an extension of an adjacent side. ¹

¹ Source: wiktionary.com

### Exterior Angle Pictures

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### Lexicographical Neighbors of Exterior Angle

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### Literary usage of Exterior angle

Below you will find example usage of this term as found in modern and/or classical literature:

1. Elements of Geometry: Containing the First Six Books of Euclid, with a by John Playfair, William Wallace (1836)
"Because the exterior angle EAB is equal to the two interior ABC, ACB, (32. 1.); and the angle EFB, at the circumference is equal to half the angle EAB at ..."

2. Plane Geometry by William Betz, Harrison Emmett Webb, Percey Franklyn Smith (1912)
"If these polygons are regular, how many degrees in each interior angle? in each exterior angle? 8. In a regular polygon a central angle is equal to an ..."

3. The Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago by Robert Simson, Euclid (1838)
"... and BD falls upon them, the exterior angle ECD is equal to the interior and opposite angle ABC; but the angle ACE was shown to be equal to the angle BAC ..."

4. Plane and Solid Geometry by George Wentworth, David Eugene Smith (1913)
"An exterior angle of a triangle is 130° and one of the opposite interior ... One exterior angle of a parallelogram is one eighth of the sum of the four ..."