This Instructional Activity is a part of the Lesson 2, Unit 2, Grade 8. What is the simplest transformation that would map one of the following figures to the other? Post new vocabulary words, definitions, and related symbolic notation in a prominent location in the room. Students will likely answer "a slide," but we want a more precise answer, so we need more information about the topic of transformations to answer this question. In the next few lessons, we learn about three kinds of simple rigid motions: translation, reflection, and rotation. We call these the basic rigid motions.