interior angle


noun Geometry.

an angle formed between parallel lines by a third line that intersects them.
an angle formed within a polygon by two adjacent sides.

Origin of interior angle

First recorded in 1750–60

British Dictionary definitions for interior angle

interior angle

noun

an angle of a polygon contained between two adjacent sides
any of the four angles made by a transversal that lie inside the region between the two intersected lines

Scientific definitions for interior angle

interior angle
[ ĭn-tîrē-ər ]

Any of the four angles formed inside two straight lines when these lines are intersected by a third straight line.
An angle formed by two adjacent sides of a polygon and included within the polygon. Compare exterior angle.