Circle Equation Calculator
From Center and Radius
From General Form Coefficients
From Three Points
Formula
(x-h)^2 + (y-k)^2 = r^2 | x^2+y^2+Dx+Ey+F=0
Frequently Asked Questions
What is the standard form of a circle equation?
(x-h)^2 + (y-k)^2 = r^2, where (h,k) is the center and r is the radius.
What is the general form?
x^2 + y^2 + Dx + Ey + F = 0, where h=-D/2, k=-E/2, r=sqrt(h^2+k^2-F).