$x(m)Y(m)Z(m)$

point A $3,-2,0$

point B

$($a$)$ Describe the position vector $r_{ab}$ in Cartesian vector form:

$-mi+$

$-mj+$

$-mk$

$($b$)$ What is the magnitude of this position vector? $||r_{ab}||=-m$

$($c$)$ What is the $x-$coordinate direction angle? $=$ in three significant figures.

$($d$)$ What is the $y-$coordinate direction angle? $=$ in three significant figures.

$($e$)$ What is the z$-$coordinate direction angle? $=$ in three