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A circle's equation can have either a general or standard form. In its general form, ax2 + by2 + cx + dy + e = 0, the circle's equation is more suitable for further calculations, while in its standard form, (x-h)^2 + (y-k)^2 = r^2, the equation contains easily identifiable graphing points like its center and radius. circle's equation can have either a general or standard form. In its general form, ax2 + by2 + cx + dy + e = 0, the circle's equation is more suitable for further calculations, while in its standard form, (x-h)^2 + (y-k)^2 = r^2, the equation contains easily identifiable graphing points like its center and radius.
The standard form of the equation of a circle is Standard Form of a Circle (x-h) 2 + (y-k) 2 = r 2 (h,k) = Center and r = Radius We can find the equation of a circle given the center and the radius or given the center and a point on the circle.Letâs look at a couple of examples.he standard form of the equation of a circle is Standard Form of a Circle (x-h) 2 + (y-k) 2 = r 2 (h,k) = Center and r = Radius We can find the equation of a circle given the center and the radius or given the center and a point on the circle. Letâs look at a couple of examples.