Hi,

I'm making a macro that involves a bezier_spline prism. What I need to know
is how I should place the control points of a bezier spline to make it
resemble a quarter circle as closely as possible.

Just to clarify, this is how they points are placed:
O-------o

             o
             |
             |
             |
             O

Big O's are endpoints, small o's control points. If I place the control
points halfway to the corner I come pretty close to a circle, but I hope
there is a more mathematical way to do it, I'm not very fond of guessing :)

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