1 Answer

Aweary · Answer 1 · 2023-08-07T07:12:54+0000

The formula for the arc length of a subtending angle is the following:

$s=2\cdot\pi\cdot r\cdot(\alpha)/(360\~)$

according to this, apply the information into the formula

$s=2\cdot\pi\cdot4\cdot(72)/(360)$

simplify the result

$\begin{gathered} s=(576)/(360)\pi \\ s=(8)/(5)\pi \end{gathered}$

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