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In geometry, a triakis tetrahedron (or kistetrahedron〔Conway, Symmetries of things, p.284〕) is an Archimedean dual solid, or a Catalan solid. Its dual is the truncated tetrahedron. It can be seen as a tetrahedron with triangular pyramids added to each face; that is, it is the Kleetope of the tetrahedron. It is very similar to the net for the 5-cell, as the net for a tetrahedron is a triangle with other triangles added to each edge, the net for the 5-cell a tetrahedron with pyramids attached to each face. This interpretation is expressed in the name. If the triakis tetrahedron has shorter edge lengths 1, it has area . == Orthogonal projections == {| class=wikitable |+ Orthogonal projection !Centered by !Edge normal !Face normal !Face/vertex !Edge |- align=center !Truncated File:tetrahedron t01 ae.png 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「triakis tetrahedron」の詳細全文を読む スポンサード リンク
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