Help students discover the relationship between diameter and circumference with this interactive.  Provides great support for visual learners who need to envision the relationship between a circle’s circumference and diameter in a different way. Set the diameter, unravel the circle and then drag the diameter onto the unraveled circumference. Flash Player required.

This mesmerizing visual representation is another option to introduce students to the relationship between diameter and circumference and understand that the relationship between the two is about 3 times in order to introduce the idea of pi.

This Study Jams resource is great for introducing students to concepts related to measuring circles by building upon their current knowledge of measuring distance around objects. Students are guided through the process of finding the circumference of a circle using pi.

OpenUp is an amazing resource for complete math lessons that allow students to learn through hands-on activities. By engaging with this lesson, students will be able to describe the relationship between circumference and diameter of any circle and explain what π means.

If students need to review finding the radius for a circle, in addition to strengthening their understanding of how to find diameter and circumference, this resource lays it all out and allows space for continued practice.

Use this practice quiz to ensure that your students have a complete understanding of how to calculate the circumference of a circle given its radius or diameter.

Take a deeper dive into the land of Pi. A substitute teacher responds to the question every student wants to know- “When will we ever use this?” In discussing pi, this teacher provides a compelling answer.

Since we’re on the topic, let Reynaldo Lopes explain the many faces of pi by demonstrating how it’s applied to the study of music, financial models, and even the density of the universe.