This unit develops students’ ability to recognize, display, analyze, measure, and reason about the shapes and visual patterns that are important features of our world. It builds on students’ elementary school exposure to simple shapes, as they begin analyzing the properties that make certain shapes unique. The Unit focuses on polygons and on the edge and angle relationships of regular and irregular polygons (circles and other curves are explored in later units). A central theme is designing shapes under constraints. As students learn important criteria that determine shape, they apply these understandings to draw figures.