A rhombus (plural rhombi) is a four-sided polygon in which every side has the same length. In any rhombus, opposite sides are parallel. Therefore, the rhombus is a special case of the parallelogram.


The area of any rhombus is a half the product of the lengths of its diagonals:

A = ½ (D1 x D2)

Because the rhombus is a parallelogram with four equal sides, the area also equals the length of a side (B) multiplied by the perpendicular distance between two opposite sides (H):

A= B x H

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