# Features of a circle from its expanded equation

Find the center and radius of a circle given the equation in expanded form.

If you're seeing this message, it means we're having trouble loading external resources for Khan Academy.

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

Main content
# Features of a circle from its expanded equation

### Problem

Find the center and radius of a circle given the equation in expanded form.