Engineering Mechanics
Varingon's theorem of moments states that if a number of coplanar forces acting on a particle are in equilibrium, then

The algebraic sum of their moments about any point in their plane is zero
Their algebraic sum is zero
The algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point
Their lines of action are at equal distances

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Engineering Mechanics
The resolved part of the resultant of two forces inclined at an angle 'θ' in a given direction is equal to

The difference of the forces multiplied by the cosine of θ
The sum of the forces multiplied by the sine of θ
The sum of the resolved parts of the forces in the given direction
The algebraic sum of the resolved parts of the forces in the given direction

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