interior angle

noun

1

: the inner of the two angles formed where two sides of a polygon come together

2

: any of the four angles formed in the area between a pair of parallel lines when a third line cuts them

Illustration of interior angle

• agh bgh ghd ghc interior angle sense 2

Examples of interior angle in a Sentence

Recent Examples on the Web

At this point the initial polygon has been reduced to a triangle, whose interior angle sum is known to be 180 degrees. — Patrick Honner, Quanta Magazine, 22 Mar. 2024

With each interior angle measuring 108 degrees, three pentagons leave a gap and four begin to overlap. — Marisa Sloan, Discover Magazine, 21 July 2021

Dehn focused on the interior angles formed where two faces of a three-dimensional shape meet. — Quanta Magazine, 31 Oct. 2019

Word History

First Known Use

1756, in the meaning defined at sense 1

Rhymes for interior angle

• disentangle
• bangle
• dangle
• jangle
• mangle
• strangle
• tangle
• wrangle
• entangle
• quadrangle
• triangle
• untangle

Kids Definition

interior angle

noun

: any of the four angles formed in the area between a pair of lines when a third line cuts them