Exterior Angle Theorem

Exterior Angle Theorem
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(3 pages)
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  • Product Description
  • StandardsNEW

I/WE/YOU do Exterior Angle Theorem

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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.
Total Pages
3 pages
Answer Key
N/A
Teaching Duration
50 minutes
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