The line $2x - y + 1 = 0$ is a tangent to the circle at the point $(2, 5)$ and the centre of the circle lies on $x - 2y = 4$. Then, the radius of the circle is: (1) $3\sqrt{5}$ (2) $5\sqrt{3}$ (3) $5\sqrt{4}$ (4) $4\sqrt{5}$
The line $2x - y + 1 = 0$ is a tangent to the circle at the point $(2, 5)$ and the centre of the circle lies on $x - 2y = 4$. Then, the radius of the circle is:\\
(1) $3\sqrt{5}$\\
(2) $5\sqrt{3}$\\
(3) $5\sqrt{4}$\\
(4) $4\sqrt{5}$