The forces which do not meet at one point and their lines of action do not lie on the same plane are known as non-coplanar non-concurrent forces

The forces which do not meet at one point and their lines of action do not lie on the same plane are known as non-coplanar non-concurrent forces

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Co-planar concurrent forces are those forces which meet at one point and their lines of action also lie on the same plane

Non-coplanar concurrent forces are those forces which meet at one point, but their lines of action do not lie on the same plane.

Non-coplanar non-concurrent forces are those forces which do not meet at one point and their lines of action do not lie on the same plane.

According to Lami's theorem, if the three forces acting at a point are in equilibrium, then each force is proportional to the sine of the angle between the other two