Applied Mechanics and Graphic Statics
The characteristic of a couple is:

All listed here
Algebraic sum of moments of forces, constituting a couple, about any point, is same
Algebraic sum of forces, constituting a couple is zero
A couple can be never the balanced by a single force

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Applied Mechanics and Graphic Statics
According to Law of Triangle of Forces

Three forces acting along the sides of a triangle are always in equilibrium
If the forces acting on a particle be represented in magnitude and direction by the two sides of a triangle taken in order, their resultant will be represented in magnitude and direction by the third
Three forces acting at a point, can be rep-resented by the sides of a triangle, each side being in proportion to the force
If three forces acting on a, point can be represented in magnitude and direction, by the sides of a triangle taken in order, these will be in equilibrium

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