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A: A rhombus is an equilateral parallelogram, which is a two-dimensional, four-sided figure in which opposite sides are parallel and all sides have equal length. A square fits this definition. However, it is usually considered a special case, and some definitions of a rhombus specify that squares are not included.
They all agree that a rhombus is an equilateral parallelogram, but one says the angles are oblique, one says the angles are USUALLY oblique (implying that they don't have to be), and one specifically says the angles are NOT right angles. So, what's the official word?