Instructional Activity# Calculating Circumference and Diameter

Lesson 3. Unit 3. Grade 7 Open Up Resources

Open Up Resources10 min(s)

This Instructional Activity is a part of the Lesson 3, Unit 3, Grade 7. In this task, students use the constant of proportionality they estimated in the previous task to calculate circumferences of circles given the diameter and vice versa. The purpose is to reinforce the proportional relationship between circumference c and diameter d and use the formula c=kd, where k is about 3 or 3.1 (the value agreed upon in the previous task).