1. Choose the direction of the arc in the options toolbar.
2. Set the center of the arc using the mouse or enter a coordinate in the command line.
3. Define the radius by clicking a point on the arc or by entering a coordinate into the command line. You may also enter the radius in the command line.
4. Set the start angle with the mouse or by entering a coordinate or the angle in the command line.
5. Set the end angle the same way as the start angle.

QCAD Professional:

• Instead of clicking a point for the radius, start angle and end angle, you can also define these values in the appropriate fields in the options toolbar or enter them directly on your keyboard. If you enter the values directly, there is no need to click into the options toolbar fields or the command line.