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Legnago is one of the famous Quadrilateral fortresses.
In shape it is quadrilateral with a cape-like prolongation into Belgium on the north.
The figures considered in § 22 are particular cases of the trapezium, which is a quadrilateral with two parallel sides.
If, AB being held fixed, the 3 quadrilateral be slightly de formed, it is obvious that the instantaneous centre J will - be at the intersection of the - .~ straight lines AD, BC, since s the displacements of the points D, C are necessarily at right angles to AD, BC, respectively.
It has the form of a quadrilateral, elongated from N.W.