Radians

Quick guide to radians

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Radians

Angles can be expressed in Radians.

The radian of an angle is the arc-length divided by the radius of the circle.

Angle in radian = 2π / 360 x angle in degrees

1 radian = 57°

45° = π / 4

90° = π / 2

180° = π

360° = 2π

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