An introductory account of certain modern ideas and methods in plane analytical geometry (1894)
Scott, Charlotte Angas, b. 1858 · London, New York : Macmillan and Co. · leaf 31
isfy a permanent relation of the form Similarly the actual distances to a line from the verticesof the triangle of reference satisfy a permanent relation, viz., a-^y + h(f + c-r- — Ihq . cr . cos A — 2ci-. ap . cos B — 2(12) ■ ^1 • ^^^ ^— 4^-Let the line make with BO, CA, AB, angles 6, (p, \/r… … Now FE = a cos (tt — 6), Fl) — U c()s 0, ED = c cos \jr, therefore dp c*)s 0 + hq cos f/> — cr cos \f/ = 2A (1). Also, from the identity p(q-r) + q{r-j,)+r{p-q)^0,by means of the relations q — r — dsmO, r — p = hiim^, p — q=—cs{n\ly,we obtain dp sin Q-\-hq sin 0 —crsin \/y = 0 (2). POINT AND…
Geometry, Analytic -- Plane
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