[Solved] Circle Center

How can I calculate the center of a circle by given 3 points that are on the border line?

Nevermind; got it...

VB Code:

Public Function GetCenter(p1 As tPoint, p2 As tPoint, p3 As tPoint) As tPoint
    Dim Det As Single
    Dim Temp As Single
    
    Dim x1 As Single, y1 As Single
    Dim x2 As Single, y2 As Single
    Dim x3 As Single, y3 As Single
    
    Dim bc As Single
    Dim cd As Single
    
    x1 = p1.X: y1 = p1.Y
    x2 = p2.X: y2 = p2.Y
    x3 = p3.X: y3 = p3.Y
    
    Temp = x2 * x2 + y2 * y2
    bc = (x1 * x1 + y1 * y1 - Temp) / 2
    cd = (Temp - x3 * x3 - y3 * y3) / 2
    Det = 1 / ( (x1 - x2) * (y2 - y3) - (x2 - x3) * (y1 - y2) )
    
    GetCenter.X = (bc * (y2 - y3) - cd * (y1 - y2)) * Det
    GetCenter.Y = ((x1 - x2) * cd - (x2 - x3) * bc) * Det
End Function