This media gallery uses video from *Cyberchase* to teach students how to determine the diameter, radius, and circumference of circle, including how to use pi to find the circumference. In the accompanying classroom activity, students test the theories presented in the videos and record their findings. This resource is part of the Math at the Core: Middle School Collection.

In this video from Cyberchase, Harry offers a definition of a circle and explains the terms radius, diameter, and circumference.

In this video from Cyberchase, learn why it’s important to label parts of a circle.

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