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 57
intersection of (1), (2): it is there-fore obtained by the elimination of x from the equations x + y + z = {), -x + y + z = Q,that is, AD is y-\-z = 0\ and similarly AG is y — z = 0.These two lines are harmonic with ivgard to y = 0, c = 0;that is, DG is divided harmonically by BC. 42 FIGURES… … these in pairs determine three diagonal points A, B, C,forming the diagonal triangle. In this diagram the line-})air (hj is harmonic with regard to be (Fig. 17). This is
Geometry, Analytic -- Plane
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