Varigon's theorem of moments states

• arithmetical sum of the moments of two forces about any point, is equal to the moments of their resultant about that point
• algebraic sum of the moments of two forces about any point, is equal to the moment of their resultant about that point
• arithmetical sum of the moments of the forces about any point in their plane, is equal to the moment of their resultant about that point
• algebraic sum of the moments of the forces about any point in their plane, is equal to the moment of their resulant about that point.