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This Triangle Angle Sum instructional video also includes:
Don't believe everything that you hear — make them prove it! The video shows two methods to prove the Triangle Angle Sum Theorem. The following two videos apply the theorem to finding missing angle measures.
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CCSS:
Adaptable
Concepts
Additional Tags
Instructional Ideas
- Use the introduction in the video as a class activity; ask pupils to draw a triangle, cut out the angles, and predict the sum of the three angles
- Post the video for future reference or those needing additional instruction
Classroom Considerations
- Assumes knowledge of the angle relationships when a transversal cuts parallel lines
Pros
- Provides both a physical and a conceptual model to prove the Triangle Sum Theorem
Cons
- Uses incorrect notation when referring to the measures of angles