Extending Root Endpoints

"Extending" a root will add a point to the end of the root.  This point can be placed anywhere within the image, therefore extending the root's length.

Use the following steps to extend an endpoint:

    1. Select the root you wish to extend.
    2. Select the Extend Endpoint Button , Edit > Extend Endpoint, or Ctrl + E.
    3. As the mouse is moved into the imagine window, a line will be drawn from the mouse cursor to the nearest root endpoint.  Move the mouse cursor to the desired location for the new point.
    4. Press and release the left mouse button to set the point.

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