Engineering Mechanics
The forces, whose lines of action are parallel to each other and act in the same directions, are known as

Unlike parallel forces
Coplanar concurrent forces
Coplanar non-concurrent forces
Like parallel forces

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

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