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Lukmdo · Answer 1 · 2022-12-12T10:33:20+0000

$4\pi$

Explanation:

$C = 2\pi r,\:\:\:\:r = 4$

The circumference of the circle of radius 4 is
$8\pi$ . Since we are dealing with only half of the circle, the arc length is then half the circumference or
$4\pi$ .

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