Create shapes

Insert a shape

Select Draw > Shapes.
Choose a basic shape, like an Oval, click anywhere in your notebook, and then drag to create the shape.

Draw a shape on a touch screen

Tap Draw with Mouse or Touch.
Tap Ink to Shape.
Draw a shape. Your hand-drawn shapes automatically turn into shapes with straight lines and clean corners.
When you're done drawing, tap Select Objects or Type Text.

Source: Microsoft