3: Measuring Circles Last updated Save as PDF Page ID 34990 Illustrative Mathematics OpenUp Resources 3.1: Circumference of a Circle 3.1.1: How Well Can You Measure? 3.1.2: Exploring Circles 3.1.3: Exploring Circumference 3.1.4: Applying Circumference 3.1.5: Circumference and Wheels 3.2: Area of a Circle 3.2.1: Estimating Areas 3.2.2: Exploring the Area of a Circle 3.2.3: Relating Area to Circumference 3.2.4: Applying Area of Circles 3.3: Let's Put it to Work 3.3.1: Distinguishing Circumference and Area 3.3.2: Stained-Glass Windows