Dowling, L. Wayland (Linnaeus Wayland), b. 1867, Turneaure, F. E. (Frederick Eugene), 1866- · New York, H. Holt and company · leaf 140
abolic mirror reflectedin parallel rays ? What use is made of this fact ? ^(•ri,y,) DIAMETERS 101. Definition. Any line through the center of a circle, anellipse, or an hyperbola is called a diameter of the curve. Any line perpendicularto the directrix of a parab-ola is called a diameterof the… … Fig. 76 102. Conjugate diameters. If P (.^\, ,?/,) is any point on acentral conic and PT is the tangent at P, then the diameterthrough P and the diameter parallel to PT are called con-jugate diameters. Thus, PO andQO are conjugate diameters (Figs.76 and 77). Theorem. If m and m are theslopes of a…
Geometry, Analytic
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