It looks like the tumble problem has been fixed. Rotating it makes it clear that the triangles are not regular. Wikipedia says they are isosceles, and that the Pentakis Dodecahedron is a Catalan Solid. Tom Tom Karzes writes:
I see 6 triangles meeting at a vertex. If the triangles are regular, then either they are coplanar or the polyhedron is concave.
Tom
Bill Gosper writes:
Johnson 93? <https://www.wolframcloud.com/objects/810fbe92-6ab3-480b-9f86-e4869990cf46> —rwg And why can't we tumble that figure? _______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
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