## Question:

Determine the coordinate direction angles of $F$, which is applied to the end $A$ of the pipe assembly, so that the moment of $F$ about $O$ is zero.

Given:

$F$ = $20$ $Ib$

$a$ = $8$ $in$

$b$ = $6$ $in$

$c$ = $6$ $in$

$d$ = $10$ $in$