This lesson introduces the concepts of basic rigid motions using informal language and prior knowledge of length and angle measures. Students experiment with rigid motions of two-dimensional figures on and off the coordinate plane. This lesson specifically focuses on translations.

Students use a Never-Sometimes-Always graphic organizer to make sense of the properties of transformations they observe throughout the lesson. As they share their solutions, they understand that when figures are moved by a translation, length and angle measures are preserved. During the lesson debrief, encourage students to connect the idea that a translation is a type of rigid motion because length and angle measures are preserved.