An elementary treatise on coordinate geometry of three dimensions (1912)
Bell, Robert J. T. (Robert John Tainsh), 1877-1963 · London : Macmillan and co., limited · leaf 273
xii. Ex. 8. If two conicoids have two common generators of the samesystem, they have two other common generators. Ex. 9. The centres of conicoids which have double contact withthe surface ax*+bf+cz*=\ at its points of intersection with the chord x=cl, y = /3, and intersectthe plane z=0 in a circle,… … Examine when the contact is real arid when the sphere lies whollywithin the ellipsoid. Cf. § 130. Ex. 11. If a conicoid is circumscribed to a sphere, every tangentplane to the sphere cuts the conicoid in a conic which has a focus atthe point of contact. Ex. 12. If a conicoid is circumscribed to…
Geometry, Analytic
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