$3.$ The bent bar $\backslash ($ A B $\backslash )$ is supported by a pin at $\backslash ($ A $\backslash )$ and a roller in a smooth slot at $\backslash ($ B $\backslash ).$ Determine the reactions at $\backslash ($ A $\backslash )$ and $\backslash ($ B $\backslash ).$ For all problems, when reporting answers for reactions that do not involve $2-$force members, report the magnitude of each reaction with an arrow that indicates the direction in which that reaction must react to maintain equilibrium of the object $($don$\text{'}$t include any $\backslash (+/-\backslash )$ signs$).$ When reporting answers that do involve $2-$force members, report the magnitude of the force felt in the $2-$force member $($which is the same as the force that $2-$force member applies to object it's connected to$),$ and tell whether the $2-$force member experiences tension or compression $($which is also what it applies to the object it's connected to$).$