Conic Sections: Polar Equations
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Adjust the eccentricity and the distance between the directrix and the origin to create conic sections. You can also rotate the curve.
Contributed by: Abby Brown (March 2011)
Open content licensed under CC BY-NC-SA
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"Conic Sections: Polar Equations"
http://demonstrations.wolfram.com/ConicSectionsPolarEquations/
Wolfram Demonstrations Project
Published: March 7 2011