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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 equation of a circle is a way to express the definition of a circle on the coordinate plane. On the coordinate plane, the formula becomes $$(x-h)^2 + (y-k)^2 =r^2 $$.n the coordinate plane, the formula becomes $$(x-h)^2 + (y-k)^2 =r^2 1  $$. h and k are the x and y coordinates of the center of the circle. $$( 2 x-9)^2 + (y-6)^2 =100 $$ is a circle centered at (9,6) with a radius of 10.