Respuesta
Arc length $s = r\theta$; Sector area $A_{\text{sector}} = \frac{1}{2} r^2 \theta$.
Explicación
If the central angle is in degrees: $s = 2\pi r \left(\frac{\theta}{360^\circ}\right)$ and $A_{\text{sector}} = \pi r^2 \left(\frac{\theta}{360^\circ}\right)$.