Arc (2D)
Add an arc by clicking the center point, and the arc's start angle and end angle.
When adding an arc, you can use auxiliary functions to draw the arc in relation to certain line elements.
- On the  tab, in the Lines
        group, click tab, in the Lines
        group, click Arc. Arc.
- Select the line properties  Line properties. Line properties.
- Select the center point of the arc.
- Click the start angle of the arc, which also determines the arc's radius.
- Click the end angle of the arc.
- Select Confirm.

