## Proportions and Similarity

In this unit plan, students will begin by exploring concepts of ratios and proportions. They will be able to write ratios and/or proportions to help them solve other problems using scale factor as well as cross products. Next, they will use that knowledge to help understand similar figures with a focus on similar triangles. Students will be introduced to many new postulates, corollaries, and theorems that will help them prove similarity. Lastly, they will inquire about which transformations preserve similarity and why. Each lesson in this unit builds upon one another so each day students are working in a logical progression. By the end of chapter seven, students should have a firm grasp on proportions and similarity.