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Mathematics 15 Online
OpenStudy (anonymous):

what is the center of the circle with the equation (x^2)+(y^2)=81

OpenStudy (anonymous):

The centre of this circle is (0,0)... Because if (x-a)^2 + (y-b)^2 = r^2, then the centre of such a circle is (a,b) while the radius is r units.

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