Trigonometry Method

$2\mathrm{.}7$ Two forces $P$ and $Q$ have the resultant $R$ as shown. If

$R=35$kip,$P=15$kip, and ${}_1=30,$ determine the

force $Q$ and the angle ${}_2$ it makes with the vertical by

trigonometry.

$2\mathrm{.}8$ Two forces $P$ and $Q$ have the resultant $R$ as shown. The

resultant $R=14kN,{}_1=40,$ and ${}_2=25.$ Deter$-$

mine the forces $P$ and $Q$ by trigonometry.