1. The tetrahedron has four faces, each an equilateral triangle.

2. Folding of square, pentagon, ellipse, spider and tetrahedron.

3. The tetrahedron is contained within the diagonals of its six faces.

4. The clays consist of silica tetrahedra and the octahedra contain magnesia surrounded by oxygen atoms and hydroxyl groups.

5. Isolated tetrahedra are linked by mutual bonding to a cation between.

6. Tetrahedron sandstone statues tower, the existing four, descending, were folded pyramid.

7. Based on the experimental results , the tetrahedron - like penetrating frame was used in actual projects.

8. An algorithm for tetrahedron mesh that can approach to the conicoid boundary during the refined process was presented.

9. Each tetrahedron shares two of its oxygens with neighboring tetrahedra.

10. We can now use tetrahedron and hexahedron elements in three - dimensional stress analysis.

11. The most likely alternative structure, the tetrahedron, would produce only one isomer for this composition.

12. The simulation calculation of kinematics for tetrahedron - tetrahedron variable geometry truss manipulator is given.

13. A new bank - protection technology using tetrahedron - like penetrating frame groups is introduced.

14. The center of inscribed circle of tetrahedron is called incenter.

15. In addition, the convergence tests of linear tetrahedron elements and the quadratic tetrahedron elements were performed. Then, the available element size and element type were determined.

16. Rings of tetrahedra are formed by bonding of two oxygens of each tetrahedron to adjacent tetrahedra in closed rings.

17. This paper presents the principle of secondary orientating by approximate tetrahedron for the first time.

18. This is the top view of an oxygen - silicon tetrahedron.

19. The Rubik's is a toy in the shape of a tetrahedron.

20. Before cutting, the algorithm projects the vertexes in the tetrahedron under cutting to cut plane,(http:///tetrahedron.html) this make the mesh easy for cutting.

21. The internal structure of silica has a pyramid ( tetrahedron ) unit .

22. A new finite element space is studied, in which the scaling function of B-spline wavelet is consider as the shape function of tetrahedron.

23. This paper tries to generalize the throwing objects from the one dimension pin to the convex curve in two dimension, and even the three dimensional regular tetrahedron and regular hexahedron .