Respuesta :

since the angle is in radians, then s = rθ.

[tex]\bf \textit{arc's length}\\\\ s=r\theta \quad \begin{cases} r=4\\ s=8\pi \end{cases}\implies 8\pi =4\theta \implies \cfrac{8\pi }{4}=\theta \implies 2\pi =\theta [/tex]

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