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

Circle

If you're using a pen, tap Circle and then tap the grid to place the center and drag your pen until you reach the correct radius length. If you want to redefine the shape’s radius, tap on the dimension label and add a value in the numpad.

If you're using a mouse or touchpad, follow these steps: 

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

Ellipse

If you're using a pen, tap Ellipse and place the center of your ellipse on the grid. Drag your pen to create the shape. You can then define the major and minor axes by tapping on the dimension labels.

If you're using a mouse or touchpad, follow these steps:

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