Angle Sum, Exterior Angles in Triangles & Parallel Lines Anchor Chart teaches students the angle measures for complementary & supplementary angles as well as the angles in a triangle. It also teaches students how to solve for an exterior angle of a triangle and angles from parallel lines cut by a transversal. This anchor chart is designed to fit on a regular sheet of paper. It can be printed out to fit in students’ notebooks, binders, or folders. It can also be used on a poster maker to create any size poster to hang in your classroom.