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

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