Engineering Mechanics
The term 'Centroid' is

None of the listed here
The same as centre of gravity
The point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis
The point of suspension

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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

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
The algebraic sum of their moments about any point in their plane is zero

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