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This Tangent Segments lesson plan also includes:
- Geometry Module 5: Teacher Materials
- Geometry Module 5: Student Materials
- Geometry Module 5: Copy Ready Materials
- Geometry Module 5, Topic C Overview
- Geometry Module 5, Topic C, Lesson 12: Teacher Version (Doc)
- Geometry Module 5, Topic C, Lesson 12: Student Version (PDF)
- Geometry Module 5, Topic C, Lesson 12: Student Version (Doc)
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What's so special about tangents? Learners first explore how if a circle is tangent to both rays of an angle, then its center is on the angle bisector. They then complete a set of exercises designed to explore further properties and theorems of tangent segments, including the construction of an incenter from the intersection of angle bisectors.
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CCSS:
Designed
Concepts
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Instructional Ideas
- Skip the opening exercise if you anticipate that learners will require more than the allotted time for the exercises
Classroom Considerations
- The lesson is a continuation of the previous intallment on tangent lines, so learners need to be familiar with tangents
- Exploration involves use of contrapositive, so be sure learners know this proof technique
- The 13th installment of a 23-part module
Pros
- Teacher resources give notes explaining the purpose and point of each exercise problem
- Learners discover properties of tangents through investigation rather than rote memorization
Cons
- None