Triangle Inequality Theorem: Lesson

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Can any three lengths make a triangle? One of the videos in a playlist on basic geometry introduces the Triangle Inequality Theorem. Using three given lengths, the presentation illustrates the restrictions on lengths of any side of a triangle in relationship to the other two.

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CCSS: Adaptable
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Instructional Ideas

  • Provide class members lengths of straws to determine whether they can form a triangle
  • Lead a discussion on how to simplify the inequalities to check by choosing the longest side
Classroom Considerations

  • Individuals should understand inequalities

  • Contains links to other CK-12 resources dealing with the Triangle Inequality Theorem
  • Shows different types of problems using the theorem

  • None
Common Core