The Cartesian coordinates of a point are given.

$($a$)(3\sqrt[\phantom{2}]{3},3)$

$($i$)$ Find polar coordinates $(r,)$ of the point, where $r>0$ and

$($ii$)$ Find polar coordinates $(r,)$ of the point, where $<mn>0</mn>$ and

$($b$)(2,-5)$

$($i$)$ Find polar coordinates $(r,)$ of the point, where $r0$ and

$($ii$)$ Find polar coordinates $(r,)$ of the point, where $r<mn>0</mn>$ and Please help me answer part b it keeps marking it wrong.