Length of Perpendicular from a Point on a Line Equations of Bisectors of Angles between two given Right Lines Area of Triangle in terms of Co-ordinates of its Vertices Area of any Polygon Condition that three Lines may meet in a Point (see also p. 34) Area of Triangle formed by three given Lines Equation of Line through the Intersection of two given Lines Test that three Equations may represent Right Lines meeting in a point Connexion between Ratios in which Sides of a Triangle are cut by any Transversal

by Lines through the Vertices which meet in a point