Rhombus -- from Wolfram MathWorld
https://mathworld.wolfram.com/Rhombus.html
WebMar 15, 2024 · A rhombus is a quadrilateral with both pairs of opposite sides parallel and all sides the same length, i.e., an equilateral parallelogram. The word rhomb is sometimes used instead of rhombus, and a rhombus is sometimes also called a diamond. A rhombus with 2theta=45 degrees is sometimes called a lozenge.
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