Lines Drawn to Another Line to Form Triangle
Illustration of two straight lines drawn from a point in a perpendicular to a given line, cutting off on the given line equal segments from the foot of the perpendicular, are equal and make equal angles with the perpendicular. This illustration can be used to show the proof.
Keywordsgeometry, triangle, vertical, lines, point, equal, angle, angles, perpendicular, intersecting, straight line
G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 19