To Create an Ellipse
1. On the Sketch tab, click the arrow next to Ellipse and then choose a method of creation:
◦ Click 
Center & Axis and select a center point.
Center & Axis and select a center point.◦ Click 
2-Point and select the start and endpoint of one of the axes.
2-Point and select the start and endpoint of one of the axes.When you select a creation method, the location of the start point is displayed, relative to the base point.
2. Select the start and end points of the ellipse.
3. To display the diameter while you create the circle, click 
. To display the radius of the circle, click 
.
. To display the radius of the circle, click .4. To lock the one of the dimensions of the entity you are creating, press Enter. Press Tab to switch to the other dimensions.
5. Select a point to size the second axis.
6. Middle-click or press ESC to exit the tool.