Question: plot nonconvex polygons

Dear all:

   Maple help page says that POLYGONS() can only be used to plot convex polygons. I wonder how can I plot nonconvex polygons?

I tried a easy example
PLOT(POLYGONS([[0,0],[0,1],[1,1],[0.2,0.4],[1,0]]),COLOR(RGB,1,0,0));

which gives me sth. very strange plot...... :(

Thanks in advance.

Peter

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