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equation of a circle

A point lies on a circle, which is centered at the origin. Find the relationship between the x-coordinate and y-coordinate of the point and the radius of the circle.



How would your answer change if the circle was centered at a location (h,k) away from the origin?

 Related External Resources

Examples of Equation of the Circle
These examples show how to find an equation and graph a circle based on different criteria.

School Bus Geometry
Determine the changes in the graph of a circle in this different form of geometry.

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