Applied Mechanics and Graphic Statics
The centre of gravity of a homogeneous body is the point at which the whole

Volume of the body is assumed to be concentrated
Weight of the body is assumed to be concentrated
Area of the surface of the body is assumed to be concentrated
All listed here

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Applied Mechanics and Graphic Statics
The necessary condition of equilibrium of a body is:

Algebraic sum of vertical components of all the forces must be zero
Algebraic sum of horizontal components of all the forces must be zero
All (A), (B) and (C)
Algebraic sum of the moments of the forces about a point must be zero

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