Please help a newcomer to Autocad 3-D

Can someone please tell me the difference between a polyline and a
region? Why is it that I am unable to extrude a simple drawing after
making it a polyline with the pedit command?
Thank you,
G. De Angelis
Reply to
Guido De Angelis
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It needs to be a closed polyline.
Reply to
B. W. Salt.
and you can't have lines that intersect (or are actually copies in the same location)
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