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.
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Learning:
Videos:
Games:
Practice Problems:
IXL Practice Problems (must practice at home):
Take a Quiz:
Videos:
- Learn Zillion Video: 8.G.A5 (3:36)
- Shmoop Video: Parallel lines and Transversals (2:37)
- Khan Academy: Angles, Parallel lines, and Transversals (7:06)
- Khan Academy: Missing Angles with a transversal (2:15)
Games:
Practice Problems:
- Regent's Prep: Practice with Parallel Angles
- Math4Kids: Make your own worksheet
- Math Games: Transversal practice problems
IXL Practice Problems (must practice at home):
Take a Quiz:
- Math10: Angles Test (25 questions)
- ProProfs Parallel Lines Quiz (13 questions)
- Sophia: Solving for angles