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Common Core: Standard

Common Core: ELA

Common Core: Math

CCLS - Math: 8.G.5

Category
Geometry
Sub-Category
Understand Congruence And Similarity Using Physical Models, Trans- Parencies, Or Geometry Software.
State Standard:
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.