The Parts of a Circle: Calculating arc length

Calculate the length of the arc marked in red given that the circumference is 12.

8

Calculate the length of the arc marked in red given that the circumference is 12.

2

Calculate the length of the arc marked in red given that the circumference is 36.

2

Calculate the length of the arc marked in red given that the circumference is 6.

$\frac{5}{6}$

Calculate the length of the arc marked in red given that the circumference is equal to 24.

$10$

Calculate the length of the arc marked in red given that the circumference is 18.

13