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 What is tetrahedron?

Tetrahedron is a polyhedron composed of four triangular faces, three of which meets at each vertex.

It has six edges and four vertices.

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elements which are having 4 electron in its valance shell and it needs 4 electrons to complete its octet  is called tetrahedron since carbon is a tetrahedron .

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in geometry, a tetrahedron (plural: tetrahedra) is a polyhedron composed of four triangular faces, three of which meet at each vertex. It has sixedges and four vertices. The tetrahedron is the only convex polyhedron that has four faces.Tetrahedron

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A solid having four plane triangular faces; a triangular pyramid.

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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

. Tetrahedron

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