About Mars' orbit describe a tetrahedron: the sphere containing this will be Jupiter's orbit.
A scalene triangle abc might also be employed, or a tetrahedron.
The tetrahedron in Fig. 32 may appear either as erect on its base or as leaning backward with its base seen from underneath.
The tetrahedron, having four equilateral triangles as faces.
Above the tetrahedron is a balloon-shaped figure, apparently drawn into shape by the attraction of the tetrahedron.
Its head was a pyramid, a tetrahedron; its length vanished in the further darkness.
There were characters in Nansalese at each point of the tetrahedron, and other characters engraved in a circle around it.
It occurs crystallized in the form of the tetrahedron, also massive and disseminated.
This puzzle concerns the painting of the four sides of a tetrahedron, or triangular pyramid.
Round Mars describe a tetrahedron; the sphere including this will be Jupiter.
solid figure contained by four triangular surfaces, 1560s, from Late Greek tetraedron, originally neuter of tetraedros (adj.) "four-sided," from tetra- "four" + hedra "seat, base, chair, face of a geometric solid," from PIE root *sed- (1) "to sit" (see sedentary).