Properties of Tangents

You know about the tangent function, but what are tangent lines to a circle? Learners investigate properties of tangents through constructions. They determine that tangents are perpendicular to the radius at the point of tangency, and that tangent segments drawn from the same point are congruent.

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CCSS: Designed
Additional Tags
Instructional Ideas
  • Use the lesson to introduce properties and theorems related to tangent lines to a circle
Classroom Considerations
  • Activity requires a compass, protractor, and straightedge
  • Proofs involve triangle congruence and other concepts covered in previous lessons
  • The 12th installment of a 23-part module
Pros
  • Teacher resource provides teaching tips, guiding questions, and scaffolding and differentiation techniques
  • Problem set includes variety of concepts and levels of difficulty
Cons
  • None
Common Core