11. In the polar coordinate system, the distance from the point $\left( 2 , \frac { \pi } { 3 } \right)$ to the line $\rho ( \cos \theta + \sqrt { 3 } \sin \theta ) = 6$ is $\_\_\_\_$.
11. In the polar coordinate system, the distance from the point $\left( 2 , \frac { \pi } { 3 } \right)$ to the line $\rho ( \cos \theta + \sqrt { 3 } \sin \theta ) = 6$ is $\_\_\_\_$.\\