Engineering Mechanics
Non-coplanar concurrent forces are those forces which

Meet at one point, but their lines of action do not lie on the same plane
Do not meet at one point, but their lines of action lie on the same plane
Meet at one point and their lines of action also lie on the same plane
Do not meet at one point and their lines of action do not lie on the same plane

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Engineering Mechanics
The term 'Centroid' is

None of the listed here
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
The same as centre of gravity

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