Loney, S. L. (Sidney Luxton), 1860-1939 · London, Macmillan and co. · leaf 160
r of tangents drawn (1) from the point (11, 3) to the.circle xr-\-y^ — ^^, (2) from the point (4, 5) to the circle 2x--+ 2i/3 - 8a; +12?/+ 21 r= 0. 171. To jincl the general equation of a circle referredto polar coordinates. Let 0 be the origin, or pole, OX the initial line, G thecentre and a the… … L. 10 146 COOKDINATE GEOMETRY. Then {Trig. Art. 164) we have CP-^ OC^-r OP-20C. OP cos COF,i.e. a^P^ + r-2Prcos(e~a),i.e. r- -2Rr cos {0 - a) + R - a ^0 (1). This is the required polar equation. 172. Particular cases of the general equation inpolar coordinates. (1) Let the initial line be taken to…
Coordinates · Geometry, Analytic
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