Determine the reaction force through A and $B$ caused by a force $P=10kN.$ The work line

of the reaction at $B$ determined horizontally, while the reaction work line passes through $A$

decide for yourself. Determine it in:

$($a$)$ Graphical way to determine

$($b$)$ Analytical way to determine

Hint: the answer is

R$\_$A $=20kN($to the top left with angle $30$ degree$)$

$R_B=17\mathrm{.}3kN($to the right$)$