Analytic geometry for colleges, universities, and technical schools (1892)
Nichols, E. W. (Edward West), 1858- · Boston [Mass.] : Leach, Shewell & Sanborn · leaf 80
through the cen-tre and the equation becomes ^2 _j_ j/2 _ 2 rr cos 0 = a^. Cor. 2. If & = 0, and / = a, the pole lies on the circum-ference and the equation becomes r = 2 a cos 9. CoE. 3. If 9 = 0, and r = 0, the pole is at the centre andthe equation becomes 40. To show that the supplemental… … 65 BIG. 23. Let PB, PA be a pair of supplemental chords. We wish toprove that they are at right angles to each other.The equation of a line through B (— «, o) is y = s (x + a).For a line through A (a, o), we have y ^ s (x — a).Multiplying these, member by member, Ave havey^ = ss (x- — rt.^) . . .…
Geometry, Analytic
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