解答
Arc length $s = r\theta$; Sector area $A_{\text{sector}} = \frac{1}{2} r^2 \theta$.
解説
If the central angle is in degrees: $s = 2\pi r \left(\frac{\theta}{360^\circ}\right)$ and $A_{\text{sector}} = \pi r^2 \left(\frac{\theta}{360^\circ}\right)$.
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How are arc length $s$ and sector area $A_{\text{sector}}$ calculated for a central angle of $\theta$ radians and radius $r$?
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