$2\mathrm{.}3$ Two structural members $B$ and $C$ are riveted to bracket $A.$ Knowing that both members are in compression and that the force is $1200$ lb in member $B$ and $1600$ lb in member $C,$ determine graphically the magnitude and direction of the resultant force exerted on the bracket.

$2\mathrm{.}4$ Two structural members $B$ and $C$ are riveted to bracket $A.$ Knowing that both members are in compression and that the force is $8$ kN in member $B$ and $12$ kN in member $C,$ determine graphically the magnitude and direction of the resultant force exerted on the bracket.

$2\mathrm{.}5$ The force $F$ of magnitude $500$ lb is to be resolved into two components along lines $a-$a and $b-b.$ Determine by trigonometry the angle $,$ knowing that the component of $F$ along line $a-a$ is to be $400$ lb $.$