Arc by center, start and end points (Geometry)

The steps of an arc definition with its center, start and end points:

1. Define the center point of the arc by giving coordinates or   mouse-clicking.
2. Define the start point of the arc by giving coordinates or   mouse-clicking.
3. Set the drawing direction (clockwise or counterclockwise) with   mouse-clicking. Define the end point of the arc by giving coordinates or   mouse-clicking, or set the central angle (4.) by giving its value. Circle can be defined by angle 360°.

Figure: Some examples for defining structural objects with Arc by center, start and end points

Figure: Drawing direction and angle definition