Strength of Materials
The necessary condition for forces to be in equilibrium is that these should be

Coplanar & Meet at one point
All be equal
Coplanar
Meet at one point

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

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