Plane and solid analytic geometry; an elementary textbook (1904)
Ashton, Charles Hamilton, 1866-1936 · New York, C. Scribner's Sons · leaf 163
Fig. 79. 146 ANALYTIC GEOMETRY [Ch. XI, § 80 coincident with the minor axis and also revolve in thepositive direction, since we have seen that the two mustpass through different quadrants. Let the student show that the angle PXCPV in whichthe minor axis lies, will always be obtuse. If, in the… … conjugate diameter, P2K2, will start coincident with the minor axis and revolve in the negative direction. For the two diameters must remain in the same quadrant. Since b2 b the product of the two slopes is —, if L is less than -, /„, a* a must be greater than -, and the two diameters must there-a…
Geometry, Analytic
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