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Resultant of a number of coplaner concurrent forces 
by polygon law of forces
Polygon law of forces is applied for finding the resultant of 
a number of coplaner forces acting at a point. It is a 
graphical method. It states that if a number of forces acting 
simultaneously on a particle are represented in magnitude 
and direction by the side of a polygon taken in order, then 
their resultant in represented in magnitude and direction 
by the closing side of polygon taken in opposite order.

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Lami’s
Theorem
Lami’s
Theorem states that if three coplaner forces 
acting at a point are in equilibrium, then each force 
is proportional to the sine of the angle between the 
other two forces.