You can draw 2D circles and ellipses by using the Circle and Ellipse tools, respectively, in the Sketch menu.

Circle

1. Select Circle in the Sketch menu. 
2. Click to add the center and circumference points. 
3. Finish the sketch and exit the tool by pressing Return. 
   If you want to remove the shape and exit the tool, then press one of the following:
   • Delete
   • Escape
     Or, secondary click (right-click) with your mouse. 

Ellipse

1. Select Ellipse in the Sketch menu. 
2. Click to add the center and circumference points. 
3. Finish the sketch and exit the tool by pressing Return. 
   If you want to remove the shape and exit the tool, then press one of the following:
   • Delete
   • Escape
     Or, secondary click (right-click) with your mouse.