Tetrahedron
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Cross Reference
Coordinate Symmetry:
"The tetrahedron is uniquely indestructible. A plane passed through the figure parallel to any one face does not alter its regularity.
"When an equilateral triangle is divided into four identical smaller triangles it will fold into a tetrahedron.
"When any arbitrary triangle is divided into four congruent triangles by bisecting its edges and joining them with new edges, it will also fold into a tetrahedron-- an irregular tetrahedron bounded by four congruent faces."
Cross-References
- Illustration #19
Citations
- SYNERGETICS ILLUSTRATION, caption #19. May'67
