Strength of Materials
If a number of forces act simultaneously on a particle, it is possible

To replace them by a single force
To replace them by a single force through C.G.
To replace them by a couple
Not a replace them by a single force

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Strength of Materials
According to Lami's theorem

Three forces acting at a point will be in equilibrium
If three forces acting upon a particle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium
Three forces acting at a point can be represented by a triangle, each side being proportional to force
If three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two

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