Lesson Plan

Conditions for a Unique Triangle—Three Sides and Two Sides and the Included Angle

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This Conditions for a Unique Triangle—Three Sides and Two Sides and the Included Angle lesson plan also includes:

Building on the previous lesson in the 29-part series, the ninth lesson asks individuals to construct a triangle given specific criteria. First, they are given three specific side lengths, followed by two sides and the included angle. Learners discover that each set of criteria leads to a unique triangle.

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CCSS: Designed
Additional Tags
Instructional Ideas
  • Provide manipulatives in place of the constructions, such as Anglegs and/or pipe cleaners
  • Ask your classes to write a journal entry describing the criteria that result in a unique triangle
Classroom Considerations
  • Requires a level of comfort with geometric construction tools
Pros
  • Includes both an opening and closing exercise 
  • Connects new concepts to real-life applications
Cons
  • None
Common Core