The first example here:
http://www.sagemath.org/doc/html/tut/node21.html
.. shows creating a circle plot via:
L = [[cos(pi*i/100),sin(pi*i/100)] for i in range(200)]
p = polygon(L, rgbcolor=(1,1,0))
p.save()          ## or   p.show()

When I try this, I get an ellipse!  Or more precisely, the plot has
unequal axis scaling.

Here's a picture:
http://backspaces.net/temp/Safari116.png

   -- Owen


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