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.

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.

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