Strength of Materials
The product of either force of couple with the arm of the couple is called

moment of the couple
moment of the forces
resultant couple
resulting couple

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Strength of Materials
If a rigid body is in equilibrium under the action of three forces, then

the lines of action of these forces meet in a point
the lines of action of these forces are parallel
these forces are equal
the lines of action of these forces meet in a point & the lines of action of these forces are parallel

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