- A parallelepiped is a quadrangle the opposite edges of which are parallel and the same length; the adjacent sides do not form a right angle.
- The diagonals are not the same length and perpendicular, but they halve one another.
- The heights are the perpendicular distances between the opposite edges.

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

- d
_{1,2}– diagonals - h
_{a}– height to edge a - h
_{b}– height to edge b

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