#angle_of_incidence__incidence_angle__incidenceangle  the angle that a line makes with a line perpendicular to the surface at the point of incidence
  supertype:  angle  the space between two lines or planes that intersect; the inclination of one line to another; measured in degrees or radians
  subtype:  angle_of_attack  the acute angle between the direction of the undisturbed relative wind and the chord of an airfoil
  subtype:  critical_angle  the smallest angle of incidence for which light is totally reflected

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