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Hello sirWhat is varignon theorem

https://en.wikipedia.org/wiki/Varignon%27s_theoremVarignon's theorem is a statement in Euclidean geometry, that deals with the construction of a particular parallelogram, the Varignon parallelogram, from an arbitrary quadrilateral (quadrangle). It is named after Pierre Varignon, whose proof was published posthumously in 1731.

https://en.wikipedia.org/wiki/Varignon%27s_theorem_(mechanics)Varignon's theorem is a theorem by French mathematician Pierre Varignon (1654-1722), published in 1687 in his book Projet d'une nouvelle mécanique. The theorem states that the torque of a resultant of two concurrent forces about any point is equal to the algebraic sum of the torques of its components about the same point. In other words, "If many concurrent forces are acting on a body, then the algebraic sum of torques of all the forces about a point in the plane of the forces is equal to the torque of their resultant about the same point."[1]