- A rhombus is a quadrangle, all sides of which are equal in length but do not form a right angle.
- The diagonals are not the same length, but they are perpendicular to one another and halve one another.
- The height is the perpendicular distance between two opposite edges.

- P – perimeter
- A – area
- a – edges

- h – height
- d
_{1,2}– diagonals - α
_{1,2}– angles

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