Analyzing Angle Measures A Practice Lesson Formative Assessment CCSS 8.G.5 Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angle-angle criterion for similarity of triangles. Students can work in pairs, teams, individually (homework) or supported by teacher to solve the "puzzle" of Angle Measures. To be efficient and accurate, students will need to understand: * Al