Excerpt from A Treatise on Conic Sections: Containing an Account of Some of the Most Important Modern Algebraic and Geometric Methods Two Equations represent Points A single Equation represents a Locus Geometric representation of Equations Equation of a Right Line' parallel to an Axis through the Origin in any Position Meaning of the Constants in Equation of a Right Line Equation of a Right Line in terms of its Intercepts on the Axes in terms of the Perpendicular on it from Origin, and the Angles it makes with Axes e Expression for the Angles a Line makes with Axes Angle between two Lines Equation of Line joining two given Points Condition that three Points shall be on one Right Line (lo-ordinates of Intersection Of two Right Lines Middle Points of Diagonals of a Quadrilateral are in a. Right Line (see also p. Equation of Perpendicular on a given Line of Perpendiculars of Triangle of Perpendiculars at Middle Points of Sides of Line making a given angle with a given Line.
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