Tetrahedrons are triangular based pyramids that have 4 faces, 6 edges and 4 vertices which were built by the ancient Egyptians.
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Tetrahedrons and quadrilaterals.
yes
good question
tetra means four.
Double tetrahedrons come in different sizes and complexities. The current online resources have no user diagrams, but some books may. You may want to consult the related link for suggestions.