Use the Ellipse tool
Expression Studio 2.0
Use the Ellipse tool to draw circles or ovals.
To draw a circle or oval
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In the Toolbox, select the Ellipse
tool. -
Using the tool, drag in your document. To constrain the shape to a circle, hold down the SHIFT key.
Tip:If you hold the ALT key when dragging, the ellipse will be centered on the point where you originally clicked. Holding down both SHIFT+ALT will center a circle on that point.
The resulting path consists of Bezier curves and anchor points that you can edit to create nonelliptical shapes.