Strength of Materials
The center of gravity of a triangle lies at the point of

Intersection of bisector of angles
Intersection of its altitudes
Concurrence of the medians
Intersection of diagonals

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Strength of Materials
According to principle of moments

if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero
positive and negative couples can be balanced
the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point
if a system of coplanar forces is in equilibrium, then their algebraic sum is zero

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