Engineering Mechanics
According to the law of moments, 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
Their lines of action are at equal distances
The algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point

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Engineering Mechanics
The moment of a force

Is equal to twice the area of the triangle, whose base is the line representing the force and whose vertex is the point, about which the moment is taken
Is the turning effect produced by a force, on the body, on which it acts
All of these
Is equal to the product of force acting on the body and the perpendicular distance of a point and the line of action of the force

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