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This online calculator displays equations of a circle in standard form, in parametric form and in general form given center and radius of a circle. Formulas can be found below the calculator.
Standard Equation of a Circle
The standard equation of a circle with the center at and radius is
Parametric Equations of a Circle
The parametric equations of a circle with the center at and radius are
General Equation of a Circle
The general equation of a circle with the center at and radius is