tetrahedron

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Related to tetrahedra: regular tetrahedron

tetrahedron:

see polyhedronpolyhedron
, closed solid bounded by plane faces; each face of a polyhedron is a polygon. A cube is a polyhedron bounded by six polygons (in this case squares) meeting at right angles.
.

Tetrahedron

A polygon with four plane surfaces.

Tetrahedron

(or triangular pyramid), a polyhedron with four triangular faces, six edges, and four vertices. At each vertex three edges intersect. The regular tetrahedron (Figure 1) is one

Figure 1

of the five regular polyhedrons. If a is the length of an edge of a regular tetrahedron, the volume of the tetrahedron is .

tetrahedron

[‚te·trə′hē·drən]
(crystallography)
An isometric crystal form in cubic crystals, in the shape of a four-faced polyhedron, each face of which is a triangle.
(mathematics)
A four-sided polyhedron.

tetrahedron

A device to indicate wind direction, and, in turn, landing direction. It is tetrahedronshaped—four triangular sides. This device is generally located at uncontrolled airports. The small end of a tetrahedron points in the direction of landing. At controlled airports, the tetrahedron should be disregarded because tower instructions supercede the indicator. On approach charts, a tetrahedron is shown as.

tetrahedron

1. a solid figure having four plane faces. A regular tetrahedron has faces that are equilateral triangles
2. any object shaped like a tetrahedron
References in periodicals archive ?
rather than to use ordinary normal surface theory on a general triangulation obtained by decomposing the truncated tetrahedra of [?
To be practical, the space is discretized into tetrahedra constructed by the Delaunay tetrahedralization [34] and the free-space support is evaluated for the tetrahedra.
i], we denote the collection of all triangular faces f of tetrahedra [tau] [member of] [[XI].
j] needed for the MRA, we use a sequence of tetrahedra, beginning with a basic net [T.
A triangular grid, quadrilateral grid, tetrahedral grid, and hexahedral grid is a grid consisting entirely of triangles, quadrilaterals, tetrahedra and hexahedra, respectively.
The generation of meshes of well-shaped tetrahedra in [R.
This example shows the time required for a finite element solver for problems with different numbers of tetrahedra.
I] corresponds to a vector of the contrast values located at the tetrahedra centroids in the domain D, and [[[?
If, for instance, you wanted to make a very dense, rigid, hard ceramic, you would probably be better off making the powder from tetrahedra," New Scientist quoted Jaoshvili's adviser, Paul Chaikin, as saying.
The Princeton researchers placed pairs of tetrahedra face-to-face, forming a kissing pattern that, viewed from the outside of the container, looks strangely jumbled and irregular, Torquato said.
People generally decompose each cube into a set of tetrahedra where a function is defined by linear interpolation, to apply such techniques to rectilinear volumetric data.

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