Strength of Materials
Two non-collinear parallel equal forces acting in opposite direction

balance each other
constitute a couple
constitute a moment of couple
constitute a moment

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