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The Polygon tool is used to create
non-uniform areas. You start a new polygon area
by moving the mouse to the first point, and clicking
the left mouse button once. Move
the cursor to the next point - you will see a
"ghost" line tracking from the starting
point to where the cursor is. Click the left
mouse button once to add this point
into the polygon and start the next line. You end
your polygon creation by either double-clicking
the left mouse button where you want the last
point to be.
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