関: rhombic、rhombus

WordNet

shaped like a rhombus or rhomboid; "rhomboidal shapes" (同)rhomboidal
a parallelogram with adjacent sides of unequal lengths; an oblique-angled parallelogram with only the opposite sides equal
any of several muscles of the upper back that help move the shoulder blade (同)rhomboid muscle
a parallelogram with four equal sides; an oblique-angled equilateral parallelogram (同)rhomb, diamond
resembling a rhombus
rhomboid muscle that draws the scapula toward the vertebral column and slightly upward (同)lesser_rhomboid_muscle, musculus_rhomboideus_minor

PrepTutorEJDIC

偏菱(へんりょう)形,長斜方形 / ひし形の,長斜方形の
ひし形 / 斜方六面体

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/04/03 07:21:44」(JST)

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These shapes are rhomboids

Traditionally, in two-dimensional geometry, a rhomboid is a parallelogram in which adjacent sides are of unequal lengths and angles are non-right angled.

A parallelogram with sides of equal length (equilateral) is a rhombus but not a rhomboid.

A parallelogram with right angled corners is a rectangle but not a rhomboid.

The term rhomboid is now more often used for a parallelepiped, a solid figure with six faces in which each face is a parallelogram and pairs of opposite faces lie in parallel planes. Some crystals are formed in three-dimensional rhomboids. This solid is also sometimes called a rhombic prism. The term occurs frequently in science terminology referring to both its two- and three-dimensional meaning.

History

Euclid introduced the term in his Elements in Book I, Definition 22,

Of quadrilateral figures, a square is that which is both equilateral and right-angled; an oblong that which is right-angled but not equilateral; a rhombus that which is equilateral but not right-angled; and a rhomboid that which has its opposite sides and angles equal to one another but is neither equilateral nor right-angled. And let quadrilaterals other than these be called trapezia.

— Translation from the page of D.E. Joyce, Dept. Math. & Comp. Sci., Clark University [1]

Euclid never used the definition of rhomboid again and introduced the word parallelogram in Proposition 31 of Book I; "In parallelogrammic areas the opposite sides and angles are equal to one another, and the diameter bisects the areas." Heath suggests that rhomboid was an older term already in use.

Symmetries

The rhomboid has no line of symmetry, but it has rotational symmetry of order 2.

In biology

In biology, rhomboid may describe a geometric rhomboid (e.g. the rhomboid muscles) or a bilaterally-symmetrical kite-shaped or diamond-shaped outline, as in leaves^[1] or cephalopod fins.^[2]

In medicine

In a type of arthritis called pseudogout, crystals of calcium pyrophosphate dihydrate accumulate in the joint, causing inflammation. Aspiration of the joint fluid reveals rhomboid-shaped crystals under a microscope.

References

^ see Leaf shape
^ "Decapodiform Fin Shapes".

External links

Weisstein, Eric W., "Rhomboid", MathWorld.

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