Example $3\mathrm{.}11$ Two forces of $800$ N and $600$ N act at a point as shown in Figure $3\mathrm{.}11.$ The

resultant of the two forces is $1200$ N $.$ Determine $$ between the forces and the direction of the

resultant.

Figure $3\mathrm{.}11$ Example $3\mathrm{.}11.$