Dowling, L. Wayland (Linnaeus Wayland), b. 1867, Turneaure, F. E. (Frederick Eugene), 1866- · New York, H. Holt and company · leaf 148
7U*2 l + r But B lies on the conic,the figure, and y Ih + ilhl + r (Art. IT). Hence, if the conic is an ellipse as in (x-i + rx^y- , (yi + ry.y ^ ^a\l + rf h\l + rf Expanding and arranging according to the powers of r, we have 1 2/2^ _ -J^ V.2 _j_ 2!^^ _|_ 2/1 ?/2 iV + + 1 Wo. Art. 105] GEOMETRIC… … Fig. 82 on the polar line of A, the coefficient of r vanishes. Hence theroots are equal but opposite in.sign; that is, AB^ AD BC ~ DC Four points A, B, C, and D situated on a straight line and such constitute a harmonic range. The segment AC that^ = -^i^BC DC is said to be divided harmonically by B…
Geometry, Analytic
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