exterior angle


noun Geometry.

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

Origin of exterior angle

First recorded in 1885–90

British Dictionary definitions for exterior angle

exterior angle

noun

an angle of a polygon contained between one side extended and the adjacent side
any of the four angles made by a transversal that are outside the region between the two intersected lines

Scientific definitions for exterior angle

exterior angle
[ ĭk-stîrē-ər ]

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