Practical Conic Sections: The Geometric Properties of Ellipses, Parabolas and HyperbolasEbookPractical Conic Sections: The Geometric Properties of Ellipses, Parabolas and HyperbolasbyJ. W. DownsRating: 0 out of 5 stars0 ratingsSave Practical Conic Sections: The Geometric Properties of Ellipses, Parabolas and Hyperbolas for later