Common Core State Standard: 8.G.5 |
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| Grade | 8 |
| Subject | MATH |
| Domain | Geometry |
| Theme | Understand congruence and similarity using physical models, transparencies, or geometry software |
| 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 three angles appear to form a line, and give an argument in terms of transversals why this is so. |
| Reference URL | http://www.corestandards.org/Math/Content/8/G |