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