if a force of 658.4 pounds is acting east and another of 316.2 pounds is acting north, what are the magnitude and direction of their resultant?
The magnitude is given by :
sqrt ( 658.4^2 + 316.2^2) = about 730.4 lbs.
The direction is given by :
arctan [ 316.2 / 658.4] = about 25.65°
+185 
