Bailey, Frederick H. (Frederick Harold), 1865- · Boston, London, Ginn & Co. · leaf 334
tersecting at the origin, and planes parallelto the plane YOZ cut the cone in hyperbolas having their EQUATIONS OF SECOND DEGREE. 319 transverse axes parallel to OZ, and also that the cone issymmetrical with respect to tlie plane YOZ. We may now sum up our work as follows : TJt.is surface isa cone… … Fig. 18. If b^ = a, the equation becomeshave a circular cone. x^ + y^ -„ ^ 0, and we * This theorem might have been stated immediately after the findingof the first elliptic section, but we continued to investigate other sectionsbecause of the instructiveness of tlie method. 320 SOLID ANALYTIC…
Geometry, Analytic
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