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Properties, area and perimeter formulas of a rhombus — and a practice trainer.
A rhombus is a parallelogram with equal sides. The diagonals are perpendicular and bisect each other.
S = d₁·d₂/2, where d₁ and d₂ are the diagonals.
A square is a special case of a rhombus with right angles. In a rhombus the angles can vary.