Formula

General Form of the Equation of a Circle

The general form of the equation of a circle is:

x2+y2+ax+by+c=0x^2 + y^2 + ax + by + c = 0

In this form, the equation is fully expanded and set equal to zero. Unlike the standard form, the general form does not directly reveal the center or radius of the circle. To identify these features, the general form must be converted to the standard form by completing the square on both the xx-terms and the yy-terms.

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Updated 2026-05-26

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Algebra