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Common Core Standards

Angles, Parallel Lines, & Triangles

Grade: 8th Grade
Standard:

Math.8.G.5 or 8.G.A.5

Description:

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.

8th Grade Math - Angles, Parallel Lines, & Triangles Lesson
 
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