The four distinct point and  are concyclic, if  is equal to

Let the general equation of the circle be

The equation of circle passing through (0, 0), (2, 0) and

      …(i)

   …(ii)

and      …(iii)

On solving Eqs. (i), (ii) and (iii), we get

The equation of circle becomes

Since, it is passes through  we get

We have already take a point , so we take only