Smart, Edward Howard · London : Macmillian and Co. · leaf 189
16. The vertices of an elliptic section of a right-angled cone are atdistances 6 and 8 inches from the vertex of the cone. Prove that theradius of the smallest sphere which can be inscribed in the cone so asto touch the plane of section is 2 inches. CHAPTER XL FOCAL, TANGENT, AND NORMAL PROPERTIES.… … Fio. 82. Then the polars of T and S intersect at L. .. ST is thepolar of L. Let ST cut the directrix at L. Then since thepolars of L and S intersect at L, LS is the polar of L. .. SLL is a self-polar triangle, and SL, SL are a pair ofconjugate lines at S. P.O. L 162 PROJECTIVE GEOMETRY But these…
Geometry, Projective
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