The figure below shows forces acting at various points on a metal bar. The angles $=50,=29,=25.$ The length $l=3\mathrm{.}6m.$ Find the net torque $($in N $-$ m $)$ on the bar about the following axes.

$$

$($i$)$

$($a$)$ an axis through $O$ perpendicular to the page

magnitude

$N*m$

direction

$--$Select$--$

$($b$)$ an axis through $C$ perpendicular to the page

magnitude $N*m$

direction

$---$Select$--$