# tetrahedron

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## 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.
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## 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 ?
Barrish, A New Facile Method for the Synthesis of 1-Arylimidazole-5-carboxylates, Tetrahedron Lett.
Information of tetrahedron mesh models Tetra Model Number of Number of Number of Name Node Spring Face Sphere 1 4K 23K 8K Sphere 2 1K 11.
Each tetrahedron originates on the host node such that coordinates assigned to it are [x.
With the 40 tetrahedrons of the star tetrahedron structure, Nassim Haramein noticed the structure had some holes (tetrahedron).
Finally, (5) can be rewritten to get expressions for shape functions of each polyhedron/hexahedron node m with respect to the tetrahedron [T.
The finite difference formulation of the strain-rate tensor components for the tetrahedron is derived below as a preliminary to the nodal formulation of the equations of motion.
The model that we propose for a System of Innovation based on S&T is illustrated by a tetrahedron (Figure 3).
2 Description of a Pavillet tetrahedron and its main property
It is possible to inscribe a tetrahedron inside a cube (Figure 2), so that the four vertices of the tetrahedron coincide with four of the eight vertices of the cube.
The computers also showed that as water approaches minus 48 C (minus 55 F), there is a sharp increase in the proportion of water molecules attached to four others to form tetrahedrons.
The striker joined in the final session as the families worked together to build a giant tetrahedron out of bamboo sticks.
They now lie at the vertices of a tetrahedron in space.

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