exterior angle

American  

noun

Geometry.

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.

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exterior angle British  

noun

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

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

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exterior angle Scientific  

/ ĭk-stîr′ē-ər /

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

2. Compare interior angle

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Etymology

Origin of exterior angle

First recorded in 1885–90

Example Sentences

See Examples For:

exterior angle

The earliest windows of this period are long and narrow, with acutely pointed heads, the exterior angle being merely chamfered and the interior widely splayed.

From Our Homeland Churches and How to Study Them by Heath, Sidney

It is said that he discovered the proposition relating to the exterior angle of a triangle.

From The Teaching of Geometry by Smith, David Eugene

At each exterior angle of the imperfect polygon was a column with a cubiform capital.

From Two Summers in Guyenne by Barker, Edward Harrison

It is in the form of a square, built round an inner courtyard, and has an immense bastion at each exterior angle.

From Westminster The Fascination of London by Smith, A. Murray, Mrs.

Let the tourist get admission at least into the garden and fling himself on that soft sward just opposite to the exterior angle of the house.

From Barchester Towers by Trollope, Anthony