This Instructional Activity is a part of the Lesson 10, Unit 3, Grade 7. The purpose of this activity is for students to think about how circumference and area of circles apply to real-world situations. First, students sort slips based on whether the question is related to the circumference or area of a circle. Next, each group focuses on one of the questions. They estimate appropriate measurements for the context, and use these measurements to calculate a reasonable answer.