Encyclopedia > Parallelogram

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A parallelogram is a four-sided plane figure that has two sets of opposing, parallel sides.

Every parallelogram is a polygon, and more specifically a quadrilateral.

Special cases of a parallelogram are rectangles, in which the two sets of opposing, parallel sides are perpendicular to each other, and squares, rectangles in which all four sides are equal.

The 3d equivalent of a prallelogram is a parallelepiped.

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Thomas a Kempis

... city of Cologne in 1838, contained at the time 400 different editions. De Backer (Essai, ut inf.) enumerates 545 Latin and about 900 French editions. Originally ...

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