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High Quality Content by WIKIPEDIA articles!An antiparallelogram or contraparallelogram is a quadrilateral in which the pairs of nonadjacent sides are congruent, but in which two opposite sides intersect (unlike in a parallelogram) and are therefore not parallel. The antiparallelogram has been used as a form of four-bar linkage, and in this context is also called a butterfly or bow-tie linkage. As a linkage, it has a point of instability in which it can be converted into a parallelogram and vice versa. For both the parallelogram and antiparallelogram linkages, if one of the long edges of the linkage is fixed as a base, the free joints move on equal circles, but in a parallelogram they move in the same direction with equal velocities while in the antiparallelogram they move in opposite directions with unequal velocities.
Redaktor Lambert M. Surhone
Redaktor Miriam T. Timpledon
Redaktor Susan F. Marseken
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