Formula
$$\begin{vmatrix} x^2+y^2 & x & y & 1 \\[0.5em] x_1^2+y_1^2 & x_1 & y_1 & 1 \\[0.5em] x_2^2+y_2^2 & x_2 & y_2 & 1 \\[0.5em] x_3^2+y_3^2 & x_3 & y_3 & 1 \\[0.5em] \end{vmatrix} $$
Variables
A(x1,y1)
→
First point of a crcle
B(x2,y2)
→
Second point of a crcle
C(x3,y3)
→
Third point of a crcle
Formula Description
We use this formula to find an equation of a circle passing through three given points.