Lesson Plan

Informal Proofs of Properties of Dilations

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Challenge the class to prove that the dilation properties always hold. The lesson plan develops an informal proof of the properties of dilations through a discussion. Two of the proofs are verified with each class member performing the dilation and showing that all arrive at the same conclusion. 

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CCSS: Designed
Additional Tags
Instructional Ideas
  • Provide a brief lesson on what is needed within informal proofs
Classroom Considerations
  • Designed as an optional lesson within the series
  • The class should have knowledge of the properties of parallel lines and transversals
  • Seventh in a unit of 16 lessons
Pros
  • Includes scaffolding to remind the class about what they know about parallel lines
  • The answer key provides sample justifications
Cons
  • None
Common Core