Common Core State Standards for Math
8.G.A.5
6b9cbaef-d7cc-11e8-824f-0242ac160002 6ba0d99c-d7cc-11e8-824f-0242ac160002 6b9eaf0c-d7cc-11e8-824f-0242ac160002 8.G.A 8.G.A.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. <em>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.</em>
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