Open Up Resources 35 min(s)Support for English Language Learners

In this lesson, students begin to see that translations, rotations, and reflections preserve lengths and angle measures, and for the first time call them rigid transformations. Observe that rigid transformations preserve lengths and angle measures. Let's compare measurements before and after translations, rotations, and reflections. Learning targets: students can describe the effects of a rigid transformation on the lengths and angles in a polygon.