This Triangle Inequality lesson plan also includes:
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This STEM lesson plan presents a guided inquiry-based activity on exploring the relationship between the side lengths of a triangle. Class members are encouraged to also find the relationship between angle measure and side lengths. Notes, a pre- and post assessment, homework, and an exit ticket offer the teacher support in covering the concept.
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CCSS:
Adaptable
Instructional Ideas
- Have the class determine an algebraic rule to quickly determine whether a triangle can be formed from any given side lengths
- Spend as much time investigating the relationship between the side lengths and angle sizes as the side inequality relationship
Classroom Considerations
- An extensive list of supplies is needed that includes uncooked spaghetti and/or straws
- Student familiarity with collaborative group roles would be beneficial
Pros
- Data notes chart provided to assist with formative assessment
- Pre-assessment is designed to determine prerequisite skills for the activity
Cons
- The Hinge Theorem relationship is treated as an after-thought or only as an extension
- Answers are not provided for the assessments
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