KnowraParallelogram lawLinked fromLinked fromThe 8 pages that link to Parallelogram law, each with the reason it gives.All 8Related 6Compared with 2Van Aubel's theoremCompared with: It gives a related vector-length identity, but Van Aubel's conclusion concerns opposite square centers.Riesz's lemmaCompared with: The lemma needs only norm axioms, not the inner-product geometry characterized by this law.