Answer:
Step-by-step explanation:
The formula for arc length (at least the geometric formula) is
[tex]AL=\frac{\theta}{360}*\pi d[/tex]
What we have here is a perfect semicircle. A semicircle has a central angle measure of 180 degrees (that's our theta value) and this circle has a diameter of 12. Therefore,
[tex]AL=\frac{180}{360}*12\pi[/tex] which simplifies nicely to
[tex]AL=\frac{1}{2}*12(3.14)[/tex] which simplifies even further to
[tex]AL=\frac{1}{2}*(37.68)[/tex] which gives you an arc length of
AL = 18.84 units
