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OpenStudy (anonymous):
What is the equation of a circle whose center is at the origin and whose radius is 9?
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OpenStudy (anonymous):
\[(x-x_a)^2+(y-y_a)^2=r^2\\ (x_a,y_a)=(0,0)\\r=radius =9\]
OpenStudy (anonymous):
First line is the equation of a circle
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