Infinitesimally Movable Polyhedron with 18 Faces

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This Demonstration shows an infinitesimally movable polyhedron with 18 faces. It is based on a real model consisting of 16 isosceles right triangles and eight equilateral triangles. For each of the two square bases, four isosceles right triangles are used.
Contributed by: Izidor Hafner (April 2014)
Open content licensed under CC BY-NC-SA
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"Infinitesimally Movable Polyhedron with 18 Faces"
http://demonstrations.wolfram.com/InfinitesimallyMovablePolyhedronWith18Faces/
Wolfram Demonstrations Project
Published: April 28 2014