( Paper Card Sort, Digital Card Sort) TranslationsĪfter the introduction to transformations, we learn about the 3 rigid motions one day at a time, starting with translations.
Then, students practice identifying translations, reflections, and rotations with a card sort. We use the dilation as a counterexample for the rigid motions. After vocabulary, we look at four transformations and students identify them as a translation, reflection, rotation, and dilation using their prior knowledge from 8th grade. We also talk about the notation of transformations and how a prime will appear after a letter for each transformation. Some of the vocabulary, such as pre-image, image, and rigid motion, is new for students. To kick off our transformations unit, we start with basic vocabulary related to transformations. Keep reading to see how I teach my high school geometry transformations unit. This unit has one big advantage: Much of what we learn here is actually repeated from 8th grade. We will not learn about dilations until we reach our similarity unit.
Specifically, congruence transformations. After studying the basics of geometry and its basic relationships among lines and angles, we move on to our transformations unit.