$4\mathrm{.}116$ The $18-$ft pole ABC is acted upon by a $210-$lb force as shown.

The pole is held by a ball$-$and$-$socket joint at A and by two cables BD and

BE$.$ For a$=9$ft$,$ determine the tension in each cable and the reaction at A$.$ Fig. P$4\mathrm{.}116$