Conditions on Measurements That Determine a Triangle

Can any three side lengths create a triangle? Your classes tackle this question and more in the 11th activity of the 29-part module. Through modeling with patty paper, individuals discover the relationship between the lengths of the sides of triangles. They also determine that two angle measures greater than 180 degrees cannot form a triangle.

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CCSS: Designed
Instructional Ideas

  • Have learners complete the practice problems as board work to check for understanding
  • Use a graphic organizer to record examples of conditions that do and don't create a triangle
Classroom Considerations

  • Activity requires patty paper
Pros

  • Provides both guided and independent practice problems
  • Connects new learning to background knowledge
Cons

  • None
Common Core