Create a Circular Arc by Start, Centre and End

Description

Create a circular arc segment using the start and end vertices, and the centre vertex.

Access

Home / Tools / Create / Line or Alignment or Polygon / Circular Arc / Start, Centre and End

Requirements

Controls

Control	Description
Name	Type the name to be assigned to the created object or click to use the next available auto incremented name.
Start	Input the start vertex.
Centre	Input the centre vertex.
End	Input the end vertex.
3D circular arc	Do one of the following: Select the checkbox to compute the circular arc in 3 dimensions. Clear the checkbox to exclude the vertices heights from the arc calculations.
Clockwise	Do one of the following to specify the direction of the arc: Select the checkbox to draw the arc in a clockwise direction. Clear the checkbox to draw the arc in an anticlockwise direction.
Create Circle	Do one of the following: Clear the checkbox to create a circular arc between the start and end vertex. Select the checkbox to create a circle that passes through the start and end point in 2 or 3 dimensions.

Notes

The circular arc is created automatically with the current Clockwise and Create Circle configurations once 3 valid vertices are input.
Tentative select the final vertex to view a preview of the arc, then toggle the Clockwise checkbox to view the alternate solution. Accept the tentative selection when the desired arc is displayed.
The circular arc is constrained to a constant grade.
Use to create lines and polygons.
If 3D is cleared:
- Distances input are interpreted as 2 dimensional distances.
- Heights are not used to compute the arc components.
- Lines will display as a circular arcs in the Plan view.
- Vertices heights are used to display the curve in 3D view.
When creating an alignment:
- You can create 2D circular arcs only.
- This tool is available providing the horizontal design standard in the create options is configured to 'None'.