Fig. 1012.30 Indestructability of the Tetrahedron:
- A plane passed through a tetrahedron parallel to
a face does not alter its regularity.
- The extensions of edges through any one vertex to
form positive and negative tetrahedra. Another
example of the essential twoness of a system.
- Vertex passed through opposite face to form another
version of positive-negative tetrahedra.
- 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.
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