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Geometry 15 Online
OpenStudy (anonymous):

what is the equation of a circle with center (1,2) and containing the point (-4,1)?

OpenStudy (mathstudent55):

|dw:1364249389108:dw| Replace h and k with 1 and 2, respectively, and use the distance formula between the center and the point on the circle to get the radius. Then replace r with the radius and square it.

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