To create objects, start at the toolbar. Select the tool you would like to draw, for example the rectangle, then press and drag on the page to open it up.
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Releasing the mouse button sets the shape. The control key on your keyboard enables you to constrain that shape.
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In this case, a square can be drawn with the rectangle tool by holding down the control key while drawing on the page.
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Ellipses and circles are drawn in the exact same fashion.
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Select the ellipse tool, then press and drag to the desired shape on your page. The Control key constrains it to a circle.
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Straight lines are drawn with the pencil tool. Click the mouse once to establish the start point of your line, move the cursor toward the end point, and click again to set it.
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Holding the control key down while moving the mouse cursor toward the endpoint will constrain its movement to 15 degree increments by default.
