Tetrahedral angle

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(Geom.) a solid angle bounded or inclosed by four plane angles.

See also: Tetrahedral

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
For the Se-Ge-Se bonds, the peak positions are at 107[+ or -]3[degrees] (for the ternary samples) [in agreement with [34]] and at 109.6[+ or -]2[degrees] (for the binary sample) [35] which are very close to the tetrahedral angle of 109.47[degrees].
107.3[degrees]) being similar to classical tetrahedral angle. Considering the energy in this system of complex, the electronic energy (EE) is -1379.6929 Hartree, and the nuclear energy is +1167.7988 Hartree, so that the total energy (TE) is -211.8941 Hartree, which indicated that the ionic complex is very stable.
During solidification, silicon atoms tend to form fourfold coordination structures with a tetrahedral angle, whereas carbon atoms tend to form threefold coordination structures with a graphite angle.
The common question of why the tetrahedral angle is 109.471[degrees] can be answered using a tetrahedron-in-a-cube, along with some Year 10 level mathematics.
After building some models of tetrahedral frames, Gilman noticed taht his frames contained bent rings, each consisting of six struts attached together so that the angle between each pair of struts is the tetrahedral angle, or roughly 109.5 [deg.].