interior angle

Noun
  1. The angle inside two adjacent sides of a polygon (synset 113913084)
    is a type of: angle - the space between two lines or planes that intersect; the inclination of one line to another; measured in degrees or radians
    subtypes: reentering angle, reentrant angle - an interior angle of a polygon that is greater than 180 degrees
    same as: internal angle

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