**NOTE**: If a number of forces are acting at a point, the components of all these forces should be found
along x- axis and y- axis separately. Then the components along x- axis should be added by considering
their signs i.e. algebraically. Similarly components along y- axis should be added algebraically. These
sums are called SF_{x}and SF_{y} respectively. Then the resultant R is given by

R^{2} = ( SF_{x})^{2} + (S F_{y})^{2}

The direction of R is found out by the angle. It makes with x- axis in the respective Quadrant. Let it be
q then

**Procedure of determining R and q **

Let F_{1}, F_{2} , F_{3} and F_{4} are four forces acting as shown in the figure.

S F_{x} = F_{1} cos a - F_{2} cos b -
F3_{ }cos f + F4_{ }cos q

S F_{y} = F_{1} sin a + F_{2} sin b - F_{3} sin f - F_{4} cos q