Ellipse by point on main axis and hull edge point : In the Change parameter window you can adjust the coordinates through values and/or variables. 
Ellipse by point on main axis, width and height : See Ellipse by point on main axis and hull edge point. In the Change parameter window you can regulate the dimension of the ellipse via Width and Height (see figure at right). 
Ellipse by main axis angle, width and height : See Ellipse by point on main axis and hull edge point In the Change parameter window you can regulate the dimension of the ellipse via width, height and the angle between the x and main axis (see figure at right). 
See Ellipse by point on main axis and hull edge point, then: > The segment, which can be found in clockwise direction between a) and b, remains intact! Start and End point can be adjusted in the Change parameter window. 
Ellipse segment by point on main axis, width, height, start and end point : See Ellipse segment by point on main axis, start and end point. Width and Height can also be adjusted in the Change parameter window. 
Ellipse segment by point on main axis, width, height, start and end angle:
Choose center point: In the dialog, the chosen point is displayed under Center point X / Center point Y.
Select point on main axis: In the dialog, the chosen point is displayed under Main axis point X / Main axis point Y.
The ellipse's orientation results from center point and main axis point.
Start and End angle are in relation to the main axis. Both can be adjusted in the dialog box Change parameter. The angular orientation is counterclockwise as usual.

Ellipse segment by main axis angle, width, height, start and end angle :
Click on the icon and follow the instructions in the status line:
Choose center point: In the dialog, the chosen point is displayed under Center point X / Center point Y.
Select angle of main axis: Determine the angle in relation to X axis and ellipse's main axis.
Select size: Drag the ellipse with desired Width and Height.
Start and End angle are in relation to the main axis. Both can be adjusted in the dialog box Change parameter. The angular orientation is counterclockwise as usual.
