CK-12 Geometry-Concepts

9.12. Circles in the Coordinate Plane http://www.ck12.org

9.12 Circles in the Coordinate Plane

Here you’ll learn how to find the standard equation for circles given their radius and center. You’ll also graph circles
in the coordinate plane.

What if you were given the length of the radius of a circle and the coordinates of its center? How could you write
the equation of the circle in the coordinate plane? After completing this Concept, you’ll be able to write the standard
equation of a circle.

Watch This

MEDIA

Click image to the left for use the URL below.

URL: http://www.ck12.org/flx/render/embeddedobject/52406

CK-12 Foundation: Chapter9CirclesintheCoordinatePlaneA

MEDIA

Click image to the left for use the URL below.

URL: http://www.ck12.org/flx/render/embeddedobject/1324

James Sousa: Write the Standard Form of a Circle

Guidance

Recall that a circle is the set of all points in a plane that are the same distance from the center. This definition can be
used to find an equation of a circle in the coordinate plane.