internal angle

English Thesaurus

1. the angle inside two adjacent sides of a polygon (noun.shape)

hypernym	:	angle,
definition	:	the space between two lines or planes that intersect; the inclination of one line to another; measured in degrees or radians (noun.shape)

hyponym	:	reentering angle, reentrant angle,
definition	:	an interior angle of a polygon that is greater than 180 degrees (noun.shape)