Varignon's Theorem

Definition

Varignon's theorem states that Moment of Force $M O$ about point $O$ is equal to the sum of the moments of the components of the force about the same point.

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$\vec{M_{O}} = \hat{r_{O A}} \times \vec{R} = \hat{r_{O A}} \times (\vec{F_{1}} + \vec{F_{2}}) = \hat{r_{O A}} \times \vec{F_{1}} + \hat{r_{O A}} \times \vec{F_{2}}$