QCad User Reference Manual

# 18. Arcs

## 18.1. Arc with Center, Radius and Angles

CAD Toolbar:

Menu:

    Draw - Arc - Center, Point, Angles

Hotkey:

    ar

Command:

    arcc

Options Toolbar:

Description:

Draw arcs with center, radius and angles given with this tool.

Procedure:

1. Choose the direction of the arc in the options toolbar or using the command `reversed`, `rev` or `r`.
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 directly in the command line.
4. Set the start angle with the mouse or by entering a coordinate or the angle amount in the command line.
5. Set the end angle the same way as the start angle.

## 18.2. Arc with 3 Points

CAD Toolbar:

Menu:

    Draw - Arc - 3 Points

Hotkey:

    a3

Command:

    arc

Description:

If you know the startpoint, the endpoint and a point in the middle on the arc line, you can use this tool to create arcs.

Procedure:

1. Set the start point using the mouse or enter a coordinate in the command line.
2. Set the second point to a known point on the arc line.
3. Set the endpoint of the arc.

## 18.3. Concentric Arc

CAD Toolbar:

Menu:

    Draw - Arc - Concentric

Hotkey:

    of

Command:

    offset, of

Options Toolbar:

Description:

With this tool you can create concentric arcs.

Procedure:

1. Enter the distance of the concentric arc from the original base arc in the options toolbar shown at the top or in the command line.
2. Enter the number of concentric arcs to create in the options toolbar.
3. Click the base arc. The concentric arc(s) are created on that side on which the mouse cursor is located while selecting the base arc.