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

In an effort to render the sculptural qualities of his design more dramatic, Saarinen made the bedroom windows unusually narrow, so that they disappeared from view from certain exterior angles.

From Los Angeles Times

Five cameras will cover each exterior angle of the 16th president’s tomb, as well as the parking lot at Oak Ridge Cemetery.

From Washington Times

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

From Project Gutenberg

If one side of a triangle be produced, the exterior angle shall be greater than either of the interior opposite angles.

From Project Gutenberg

ABC is an exterior angle or angle of the polygon.

From Project Gutenberg