The (unknown) coordinates of the circumcentre will be denoted by (x,y)(x,y). Recall that the circumcentre is equidistant to all vertices: D1=D2=D3D1=D2=D3, where DiDi is the distance between (xi,yi)(xi,yi) and (x,y)(x,y) for i=1,2,3i=1,2,3. Applying the formula ...