Grade 8 - Geometry
Standard 8.G.A.5 - Practice finding complementary, supplementary, vertical, and adjacent angles.
Included Skills: Geometry
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. For example, arrange three copies of the same triangle so that the sum of the three angles appears to form a line, and give an argument in terms of transversals why this is so.