Angles

The inclination of one line to another. One complete revolution equals 360° (degrees) or 2π radians.

The five types of angles are zero, acute, right, obtuse, and straight.

See also: Coterminal Angles, Initial Side, Obtuse Angle, Protractor, Radian, Reflex Angle, Straight Angle, Supplementary Angles, Terminal Side, Vertical Angles, Zero Angle.