2.
在平面直角坐标系\(xOy\)中,直线\(l\)的参数方程为\(\begin{cases} x{=}\dfrac{\sqrt{2}}{2}t \\ y{=}\dfrac{\sqrt{2}}{2}t \end{cases}\ (t\)为参数\()\),圆\(C\)的方程为\(x^{2}{+}y^{2}{-}4x{-}2y{+}4{=}0{.}\)以\(O\)为极点,\(x\)轴正半轴为极轴建立极坐标系.
\((1)\)求\(l\)的普通方程及极坐标方程与圆\(C\)的极坐标方程;
\((2)\)已知\(l\)与\(C\)交于\(P{,}Q\),求\({|}{PQ}{|}\).