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well... take another exemple :
1- create a circle and validate to exit the tool
2- pick the move or universal manipulator
3- keep CTRL key (or Command on Mac) and move your cirlce like that
>> as result, you should see the original circle stay on it original position and a kind of extrusion appears. This is what is call "edge modeling", a kind of extrusion from a set of edges.
You can also create one polygon (with the polygon tool), select one edge, and repeat step 3 above, you should see a polygon appears while you move your selection with the CTRL key pressed.
I hope it will help !
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