A radian is defined as follows.

$360^{\circ} = 2 \pi$ radians.

Dividing both sides by $2\pi$, one radian is:

$ \frac{180}{\pi}^{\circ} = 1$ radian.

Skip to content
Trigonometry # The Radian

A radian is defined as follows.

$360^{\circ} = 2 \pi$ radians.

Dividing both sides by $2\pi$, one radian is:

$ \frac{180}{\pi}^{\circ} = 1$ radian.

Back To Top