System of Measurement of Angles
Sexagesimal System
right angle
minutes
seconds
Centesimal System
right angle
grads
grade
minutes
minute
seconds
Circular System
Radian: One radian , is the measure of the angle subtended at the center of a circle by an arc of length equal to the radius of the circle.
The number of radians in an angle subtended by an arc of a circle is equal to
Relation between Degrees and Radians