Unit 7
Circles
Unit Narrative
In this unit, students investigate the geometry of circles more closely. In grade 7, students used formulas for the area and circumference of a circle to solve problems. Earlier in this course, students made formal geometric constructions, studied similarity and proportional reasoning, and proved theorems about lines and angles. This unit builds on these skills and concepts. In Algebra 2, the concepts learned in this unit will be helpful as students connect the unit circle to trigonometric functions.
Students define the terms “chord,” “arc,” and “central angle” before observing that...