interior angle

noun

Geometry.

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

2. an angle formed within a polygon by two adjacent sides.

interior angle

noun

1. an angle of a polygon contained between two adjacent sides

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

interior angle

1. Any of the four angles formed inside two straight lines when these lines are intersected by a third straight line.

2. An angle formed by two adjacent sides of a polygon and included within the polygon.

3. Compare exterior angle

Word History and Origins

Origin of interior angle¹

First recorded in 1750–60