$2\mathrm{.}17$ Solve Prob. $2\mathrm{.}4$ by trigonometry. Fig. P$2\mathrm{.}4$

Two forces $P$ and $Q$ are applied as shown at point $A$ of a hook support. Knowing that $P$

$=60lb$ and $Q=25lb,$ determine graphically the magnitude and direction of their

resultant using $($a$)$ the parallelogram law, $($b$)$ the triangle rule.