ON CONIC SECTIONS: CONTAINING AN ACCOUNT OF SOME OF THE MOST IMPORTANT MODERN BY GEORGE SALMON, D.D., D.C.L., LL.D.. F.R.S., REGIUS PROFESSOR OF DIVINITY IN THE UNIVERSITY OF DUBLIN. SIXTH EDITION. London: LONGMANS, GREEN, AND CO. 1879. Length of Perpendicular from a Point on a Line Condition that three Lines may meet in a Point (see also p. 34) Equation of Line through the Intersection of two given Lines Test that three Equations may represent Right Lines meeting in a Point by Lines through the Vertices which meet in a Point Polar Equation of a Right Line EXAMPLES ON THE RIGHT LINE. Investigation of Rectilinear Loci of Loci leading to Equations of Higher Degree Centre of Mean Position of a series of Points Right Line passes through a Fixed Point if Constants in its Equation be Loci solved by Polar Coordinates THE RIGHT LINE.-ABRIDGED NOTATION. Meaning of Constant & in Equation a = kẞ Bisectors of Angles, Bisectors of Sides, &c. of a Triangle meet in a Point Proof that middle Points of Diagonals of Quadrilateral lie in a Right Line Line cut harmonically by a Circle, Point, and its Polar Equation of pair of Tangents from a given Point to a Circle . 96 |