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This Informal Proofs of Properties of Dilations lesson plan also includes:
- Informal Proofs of Properties of Dilations (Doc)
- Informal Proofs of Properties of Dilations (PDF)
- Informal Proofs of Properties of Dilations (Doc)
- Grade 8 Module 3: Teacher Materials
- Grade 8 Module 3: Student Materials
- Grade 8 Module 3: Copy Ready Materials
- Math Fluency Support for Grades 6-8
- Answer Key
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Challenge the class to prove that the dilation properties always hold. The lesson 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
Concepts
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