In geometry, the great triakis icosahedron is a nonconvex isohedral polyhedron. It is the dual of the uniform great stellated truncated dodecahedron. Its faces are isosceles triangles. Part of each triangle lies within the solid, hence is invisible in solid models.
Proportions The triangles have one angle of and two of . The dihedral angle equals .
See also Triakis icosahedron
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