Arc

The Arc Line tool is used to draw arcs by specifying the center-point, and the two end points. The arc can be drawn clockwise or counter-clockwise between the two points.

Using the mouse

The first click of the left mouse button sets the center point of the arc.

The second click sets the start point of the arc (this effectively sets both the radius and the start angle of the arc).

The third click sets the end point of the arc. If you hold down the Ctrl key while clicking on this third point (as the prompt explains in the image below), the arc is drawn clockwise from the start point to the end point. Otherwise, it goes counter-clockwise.

Using the keyboard

Type in the Center, Radius, Start angle and End angle and then press Enter to draw an arc.

Direction of the arc

If you specify an end angle that is lesser than the start angle, the arc goes clockwise.
If you specify an end angle that is greater than the start angle, the arc goes counter-clockwise.