The '''Parallelogram Law''' for [[Vector|vectors]] asserts the [[Commutativity|commutativity]] of vector [[Addition|addition]]. When the vectors are placed head to tail, they form a [[Parallelogram|parallelogram]], hence the pictorial reason for the name of the law.
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The '''Parallelogram Law''' for [[vector]]s asserts the [[commutativity]] of vector [[addition]]. When the vectors are placed head to tail, they form a [[parallelogram]], hence the pictorial reason for the name of the law.