Which of the following diagrams represent a single arc?

Select all that apply.

The arc in the diagram goes half-way around the circle which has a radius of $9$9 cm:

The arc in the diagram goes a quarter of the way around the circle:

The angle $\angle AXB$∠AXB is equal to $120^\circ$120°.

uses formulas to calculate the areas of quadrilaterals and circles, and converts between units of area