A curvilinear angle formed between a circle and a straight line tangent to it, or, more generally, the angle formed between two curves at a point where they are tangent to each other.

plural of facial angle

In craniometry, the angle formed by lines drawn to show to what extent the jaws are protruding and the forehead receding.

Angles which occupy the same relative position at each intersection where a straight line crosses two others. If the two lines are parallel, the corresponding angles are equal.

(geometry) Either of the angles directly opposite to each other when two lines intersect in a plane.

Any of a set of angles whose sum is 360° or 2π radians.

(geometry) Either of a pair of angles that share a common side

The angle formed by the line of sight and the horizontal plane for an object below the horizontal.

The angle formed by the line of sight and the horizontal plane for an object above the horizontal.

(mathematics) An angle that defines a position on a circle.