Question

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Find the arc length of the semicircle.

Answer 1

Known :

r = 5

θ = 180°

Asked :

Arc length of the semicircle = ...?

Answer :

Arc length

`= (θ)/(360) * 2\pi r \\ = (180)/(360) * 2 * 3.14 * 5 \\ = (1)/(2) * 31.4 \\ = (1)/(2) * (314)/(10) \\ = (314)/(20) \\ = 15.7`

So, the arc length of the semicircle is 15,7 units

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