Main content

# Circles: Radius, Diameter and Circumference

Understanding the relationship between the radius diameter and circumference of a circle.

If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains ***.kastatic.org** and ***.kasandbox.org** are unblocked.

Main content

Understanding the relationship between the radius diameter and circumference of a circle.