Tetrahedral angle

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

See also: Tetrahedral

References in periodicals archive ?
The common question of why the tetrahedral angle is 109.
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.