KnowraParallelogramLinked fromLinked fromThe 11 pages that link to Parallelogram, each with the reason it gives.All 11Broader topic 4Related 2Narrower topic 2Compared with 3Cross productRelated: The cross product's magnitude equals the area of the parallelogram spanned by its inputs.Cyclic quadrilateralCompared with: A parallelogram is cyclic only when it is a rectangle.RectangleNarrower topic: Rectangles are parallelograms with four right angles.Triangle areaRelated: Two congruent copies of a triangle can form a parallelogram with twice its area.SquareCompared with: A square is a special parallelogram with equal sides and right angles.QuadrilateralCompared with: It provides the standard comparison for deciding whether a quadrilateral belongs to a narrower family.Parallelogram lawBroader topic: For geometric vectors, the identity says the squared diagonals sum to the squared side lengths multiplied by two.Van Aubel's theoremBroader topic: Its paired side vectors make the center relationships especially transparent.Euler's quadrilateral theoremBroader topic: Its diagonals share a midpoint, reducing the theorem to the parallelogram law.British flag theoremBroader topic: The squared-diagonal identity extends from rectangles to all parallelograms.Thébault's theoremNarrower topic: Its parallel opposite sides supply the paired directions used in the square-center construction.