Question

HEEEEEELLLLLLLLLPPPPPPPPPP!!!!!!!!!!!!!!!!!!!! Find the arc length of the semicircle.

Answer 1

Known :

r = 5

θ = 180°

Asked :

Arc length of the semicircle = ...?

Answer :

Arc length

$= \frac{θ}{360} \times 2\pi r \\ = \frac{180}{360} \times 2 \times 3.14 \times 5 \\ = \frac{1}{2} \times 31.4 \\ = \frac{1}{2} \times \frac{314}{10} \\ = \frac{314}{20} \\ = 15.7$

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

Hope it helps and is useful :)