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This Parallel Lines and Triangles instructional video also includes:
Triangles bring sums to geometry. The lesson presents two theorems dealing with the angles of a triangle. Pupils learn about the Triangle Sum Theorem and the Exterior Angle Theorem, and then apply the theorems to create equations and find missing angles.
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CCSS:
Adaptable
Concepts
Instructional Ideas
- As a class, develop the proof of the Exterior Angle Theorem
Classroom Considerations
- Requires knowledge of solving equations
- Fourth section of a seven-part Parallel and Perpendicular Lines unit
- This video is hosted on YouTube
Pros
- Demonstrates the two-column proof of the Triangle Sum Theorem
- Answer key shows the solving steps in finding the solution to the problem
Cons
- None