6.
在平面直角坐标系\(xOy\)中,直线\(l\)的参数方程为\(\begin{cases} & x=3-\dfrac{\sqrt{2}}{2}t \\ & y=\sqrt{5}+\dfrac{\sqrt{2}}{2}t \end{cases}\)\((\)\(t\)为参数\()\)。在极坐标系\((\)与直角坐标系\(xOy\)取相同的长度单位,且以原点\(O\)为极点,以\(x\)轴正半轴为极轴\()\)中,圆\(C\)的极坐标方程为\(\rho =2\sqrt{5}\sin \theta \)
\((1)\)求直线\(l\)的普通方程和圆\(C\)的直角坐标方程;
\((2)\)设直线\(l\)与圆\(C\)交于\(A,B\)两点,若点\(P\)的坐标为\(\left( 3,\sqrt{5} \right)\),求\(\left| PA \right|+\left| PB \right|\)