#oblique_angle__obliqueangle  an angle that is not a right angle or a multiple of a right angle
  exclusion:  #right_angle
  supertype:  #angle  the space between two lines or planes that intersect; the inclination of one line to another; measured in degrees or radians
  subtype:  #acute_angle__acuteangle  an angle less than 90 degrees but more than 0 degrees
  subtype:  #obtuse_angle  an angle between 90 and 180 degrees

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