Circle

If one of the diameters of the circle \(x^2+y^2-10 x+4 y+13=0\) is a chord of another circle \(\mathrm{C}\), whose center is the point of intersection of the lines \(2 x+3 y=12\) and \(3 x-2 y=5\), then the radius of the circle \(\mathrm{C}\) is :