Triangle With Segment Extended for Exterior Angle
Illustration showing a triangle with an exterior segment drawn to show and exterior angle. This can be shown to show adjacent angles ACB and ACD as well.
Keywordsgeometry, triangle, shape, lines, angle, side, triangles, angles, Sides, polygon, straight line, exterior segment, adjacent angles
G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 30