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

/ ĭn-tîr′ē-ər /

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

Example Sentences

The families feature a parameter that you can adjust infinitely many ways to make some interior angles smaller and others proportionally larger while maintaining the ability to tile space.

From Quanta Magazine

Below the bar are four small spots, beginning at the interior angle (the first being double).

From Project Gutenberg

At the left of this figure is a groove, suggesting that this was an interior angle stone.

From Project Gutenberg

A groove to the left of the group seems to show that this slab was at an interior angle of a building.

From Project Gutenberg