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Triakis tetrahedron
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In geometry, a triakis tetrahedron is a Catalan solid with 12 faces. Each Catalan solid is the dual of an Archimedean solid. The dual of the triakis tetrahedron is the truncated tetrahedron.
Wikipedia
Conway notation
:
kT
Dihedral angle
:
129°31′16″;
arccos
(−7/11)
Faces
:
12
Vertices
:
8