Menu: Draw / Ellipse / Axis, End 
Creates an ellipse by the endpoints of the major axis, and an endpoint of the minor axis.
- Select the endpoints of the major axis, or enter the major axis length and angle in the Inspector Bar.
- Set the length of the minor axis, which is always perpendicular to the major axis. You can also enter the axis length in the Inspector Bar.
Local menu option: Center 
Enables you to set the center of the ellipse, which is the same as using the Ellipse: Center tool.