# Steiner Formula for Cassini Oval

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A Cassini oval is the locus of points such that , where and . If the foci and , then

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Contributed by: Marko Razpet and Izidor Hafner (August 2018)

Open content licensed under CC BY-NC-SA

## Details

Reference

[1] A. Ostermann and G. Wanner, *Geometry by Its History*, New York: Springer, 2012.

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