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If I have just a circle, without a surface. How do I cap it (create a surface in it) so I can extrude a "solid" cylinder?

I have tried to create a new circle inside with the same radius, but it works sometimes, but mostly not (nothing happens).

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up vote 2 down vote accepted

I figured out the answer...

To fill "any" outlined polygon (without any surfaces), select the line tool and draw a line along any one segment in the figure. This will fill the polygon with a surface.

So far it has always worked for me.

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