Tell me more ×  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).  share|improve this question add comment  1 Answer  up
vote 0 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.  share|improve this answer add comment  Your
Answer