.Six equal rods AB, BC, CD, DE, FE and FA are each of weight W and are freely jointed at there extremities so as to form a hexagon, the rod AB is fixed in a horizontal position and the middle points...

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Extracted text: .Six equal rods AB, BC, CD, DE, FE and FA are each of weight W and are freely jointed at there extremities so as to form a hexagon, the rod AB is fixed in a horizontal position and the middle points of AB and DE are jointed by a string; prove that its tension is 3W.