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.
The features of a circle
Learn about the graphs of circles, and how their center and radius are represented algebraically.
Given information about the center and radius of a circle, graph it.
Given the graph of a circle, find its center and radius.