解答
$s = r \cdot \theta$, where $r$ is the radius and $\theta$ is measured in radians.
解説
If angle is given in degrees, convert via $\theta_{\text{rad}} = \theta_{\text{deg}} \times \frac{\pi}{180^\circ}$. Sector area is $A = \frac{1}{2}r^2\theta$.
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What is the arc length formula $s$ for a central angle $\theta$ in radians?
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