Lesson 17
Working with Rigid Transformations
Lesson Narrative
In previous grades, students describe a sequence of rigid transformations that exhibits the congruence between two figures. To prepare students for future congruence proofs, this lesson asks students to come up with a systematic, pointbypoint sequence of transformations that will work to take any pair of congruent polygons onto one another. As the focus shifts to sequences of transformations between figures with more general characteristics rather than specific measurements, encourage students to explain how they know that their sequences will cause certain points or lines to coincide. When students consider how generalizable a strategy for defining sequences of rigid transformation is, they are looking for the structures of pairs of congruent figures (MP7).
Learning Goals
Teacher Facing
 Compare and contrast (orally) diagrams of transformations.
 Comprehend that the notation $A'$ represents the image of point $A$.
 Explain (orally and in writing) a sequence of transformations that take given points to another set of points.
Student Facing
 Let’s compare transformed figures.
Required Materials
Learning Targets
Student Facing
 I can describe a transformation that takes given points to another set of points.
CCSS Standards
Building On
Addressing
Building Towards
Print Formatted Materials
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