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• fork, crotch go
  the angle formed by the inner sides of the legs where they join the human trunk
  
• axil go
  the upper angle between an axis and an offshoot such as a branch or leafstalk
  
• helix angle go
  the constant angle at which a helix cuts the elements of a cylinder or cone
  
• complementary angles go
  two angles whose sum is a right angle
  
• angular distance go
  the angular separation between two objects as perceived by an observer
  
• plane angle go
  an angle formed by two straight lines (in the same plane)
  
• spherical angle go
  an angle formed at the intersection of the arcs of two great circles
  
• solid angle go
  an angle formed by three or more planes intersecting at a common point (the vertex)
  
• inclination, angle of inclination go
  (geometry) the angle formed by the x-axis and a given line (measured counterclockwise from the positive half of the x-axis)
  
• inclination, inclination of an orbit go
  (astronomy) the angle between the plane of the orbit and the plane of the ecliptic stated in degrees
  
• salient angle go
  an angle pointing outward
  
• interior angle, internal angle go
  the angle inside two adjacent sides of a polygon
  
• exterior angle, external angle go
  the supplement of an interior angle of a polygon
  
• angle of incidence, incidence angle go
  the angle that a line makes with a line perpendicular to the surface at the point of incidence
  
• angle of reflection go
  the angle between a reflected ray and a line perpendicular to the reflecting surface at the point of incidence
  
• angle of refraction go
  the angle between a refracted ray and a line perpendicular to the surface between the two media at the point of refraction
  
• angle of extinction, extinction angle go
  the angle from its axis that a crystal must be rotated before appearing maximally dark when viewed in polarized light
  
• dogleg go
  angle that resembles the hind leg of a dog
  
• right angle go
  the 90 degree angle between two perpendicular lines
  
• oblique angle go
  an angle that is not a right angle or a multiple of a right angle
  
• reflex angle go
  an angle greater than 180 degrees (but less than 360)
  
• perigon, round angle go
  an angle of 360 degrees
  
• cutting angle go
  the angle between the face of a cutting tool and the surface of the work
  
• inclination, dip, angle of dip, magnetic dip, magnetic inclination go
  (physics) the angle that a magnetic needle makes with the plane of the horizon
  
• lead go
  the angle between the direction a gun is aimed and the position of a moving target (correcting for the flight time of the missile)
  
• variation, magnetic declination, magnetic variation go
  the angle (at a particular location) between magnetic north and true north
  
• AZ, azimuth go
  the azimuth of a celestial body is the angle between the vertical plane containing it and the plane of the meridian
  
• polyhedral angle go
  the space enclosed by three or more planes that intersect in a vertex
  
• face angle go
  the angle formed by two edges of a polyhedral angle
  
• tilt angle go
  the angle a rocket makes with the vertical as it curves along its trajectory
  
• vertical angle go
  either of two equal and opposite angles formed by the intersection of two straight lines
  
• view angle, angle of view go
  the angle included by a photographic lens
  
• wave angle go
  the angle of arrival (or departure) of a radio wave with respect to the axis of an antenna array