Triangle Sum Theorem: Lesson

This Triangle Sum Theorem: Lesson video also includes:

The measures all add up. The presentation, part of a helpful playlist on geometry, provides the statement of the Triangle Sum Theorem. Using the theorem, the video shows how to find the missing measure of an angle.

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CCSS: Adaptable
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Instructional Ideas
  • Develop a proof of the Triangle Sum Theorem
Classroom Considerations
  • Individuals should know how to solve linear equations
  • The class should be familiar with different types of triangles
  • Works a variety of problems using the Triangle Sum Theorem
  • Links to other CK-12 resources on finding the angle of a triangle
  • None
Common Core