Since forces are vector quantities, you must add them geometrically  instead of

 Since forces are vector quantities, you must add them geometrically  instead of

 Since forces are vector quantities, you must add them geometrically  instead of algebraically.  This can be done by calculating the x and y  components of the forces and adding (or subtracting) those components.   Knowledge of triangles and trigonometry is required to solve these  problems. 
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