Resizing a Diameter
Use the following steps to move a diameter:
1. Select the root associated with the diameter to be resized.
2. With the mouse cursor on top-most portion of the root's diameter, press and release the left mouse button. Note: when the mouse's cursor is over correct area, it will appear as a two-sided arrow pointing north and south.
3. Move the mouse cursor away from the root to increase the diameter length; move the cursor closer to the root to decrease its length.
4. Press and release the left mouse button to set the diameter.
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