Yes
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That the forces sum to a non-zero resultant.
it is applicable to two forces only
THE POLYGON LAW states that if (n-1) similar vectors acting at a point in a plane can be represented both in magnitude and direction by the (n-1) consecutive sides of a n-sided polygon then the n-th side will represent the resultant vector in the reverse order.
~(A => B) is ~B => ~A That is to say, the converse of "A implies B" is "the converse of B implies the converse of A". In this case: If a shape is not a parallelogram then it is not a rectangle.
Two polygons are similar if they meet the following criteria. They must have the same number of sides. Each vertex of one polygon has a corresponding vertex on the other polygon with same angle measurement. Each side on one polygon is proportional to a corresponding side on the other one by the same scalar multiple. If the two polygons are triangles, then if angle criteria is satisfied the side proportion will automatically be satisfied. The converse is true as well. For other polygons, both sides and angles must be tested. An example would be a square and a rhombus.