Circle   A·x² + A·y² + B·x + C·y + D = 0
Write the coefficients in the boxes.  Then press 
A =    B =
C =    D =

C1 =    C2 =    R =
 R2 =

If you have to put a coefficient using some function symbol (1/5,π,√2,...), put it in a numerical form (calcolatrice)

notes

esempi