rhombus
Noun
Meaning
Same as Rhomb, 1.
Source: Webster's dictionarySynonyms
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..how the movement of the passers-by [in his Street scene painting of 191-14] is comprehended in the rhombus of the heads which is twice repeated. In this way life and movement arise from an original geometric form. [Kirchner designed a diagram together with this line in the letter].
A quadrilateral is a square if and only if it is both a rhombus and a rectangle (four equal sides and four equal angles).
A parallelogram which is not a rhombus.
They were flat diamond, lozenge (or rhombus )-shaped sheets or "blanks" which had been precut to shape before being fed to the machine for creasing and made ready for folding to form a rectangular enclosure.
The rectangular cuboid (six rectangular faces), cube (six square faces), and the rhombohedron (six rhombus faces) are all specific cases of parallelepiped.
In the case of an orthodiagonal quadrilateral (e.g. rhombus, square, and kite), this formula reduces to since θ is 90°.