Analytic geometry for colleges, universities, and technical schools (1892)
Nichols, E. W. (Edward West), 1858- · Boston [Mass.] : Leach, Shewell & Sanborn · leaf 121
-^,0 106 PLANE ANALYTIC GEOMETRY.. CHAPTER VII.THE ELLIPSE. 74. The ellipse is the locus of a point so moving in a planethat the sum of its distances from two fixed points is alwaysconstant and equal to a given line. The fixed points arecalled the Foci of the ellipse. If the points are on thegiven… … Fig. 35. Let F, Fi be the foci and AA the transverse axis. DrawOY J_ to AA at its middle point, and take OY, OX as theco-ordinate axes. THE ELLIPSE. 107 Let P be ar.y point of the curve. Draw PF, PFj; drawalso PD II to OY. Then (OD, DP) = (x, y) are the co-ordinates of P. Let AA= 2a, FFi = 20F =…
Geometry, Analytic
Internet Archive · Boston College Libraries · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-378-261.webp)
