Center and radius of a circle

We know that the general equation for a circle is ( x - h )^2 + ( y - k )^2 = r^2, where ( h, k ) is the center and r is the radius. So add 21 to both sides to

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Equation Of A Circle

To find the center & radius of a circle, put the circle equation in standard form. We can also use three points on a circle (or two points if they are at
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