To Create an Ellipse by Defining the Center and Axis
1. Click Sketch and then click the arrow next to Ellipse.
2. Click
Center and Axis Ellipse.
3. Select a point for the center of the ellipse. The first axis is created.
4. Move the axis to the desired length and orientation and select an endpoint. The second axis and the ellipse circumference are created.
5. Move the pointer to define the length of the second axis and select an endpoint. The ellipse is created.