What percentage of a circle is covered by a sector with a central angle of ?

A circle has area . Give the length of a arc of the circle.

What percent of the above circle has not been shaded in?

Note: Figure NOT drawn to scale.

Refer to the above diagram.

The area of the shaded sector is . The area of the white sector is .

What is the length of arc ?

What percent of the above circle has been shaded?

Note: Figure NOT drawn to scale.

Refer to the above diagram.

The length of arc is .

The length of arc is .

What is the area of the white sector?

If a sector covers of the area of a given circle, what is the measure of that sector's central angle?

Figure is not drawn to scale.

What percent of the circle has not been shaded?

Find the length of the minor arc if the circle has a circumference of .