The elements of plane analytic geometry. A text-book including numerous examples and applications, and especially designed for beginners (1903)
Briggs, George R. (George Russell), b. 1853, Bôcher, Maxime, 1867-1918 · New York, J. Wiley & sons; [etc., etc.] · leaf 167
159 ^ = K (2) the slope of the original set of chords. Therefore, if one of two diameters bisects chords parallel to thtother ^ the second will also bisect all chords parallel to the first. Such diameters are called co7iju-gate. In the figure, P^ P^ andP^ P^ represent a pair ofconjugate diameters… … \\ = -r. (3) Note. The results of this section may be obtained at oncefrom equation (7) of the last section by writing it in the form b \ = where Xj bears the same relation to A which, in the original form,X bore to \. From this we may draw the inferences stated inthis section. Equation (3) shows…
Geometry, Analytic -- Plane
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