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Dodecahedron 5-Compound


Dodecahedron5Compounds

A compound of five regular dodecahedra with the symmetry of the icosahedron (Wenninger 1983, pp. 145-147) can be constructed by taking a dodecahedron with top and bottom vertices aligned along the z-axis and one vertex oriented in the direction of the x-axis, rotating about the y-axis by an angle

 alpha=cos^(-1)(sqrt(2/(15)(5+sqrt(5)))),
(1)

and then rotating this solid by angles 2pi/5 radians for i=0, 1, ..., 4. A number of other attractive compounds can also be constructed, as illustrated above.

The dodecahedron 5-compounds illustrated above are implemented in the Wolfram Language as PolyhedronData[{"DodecahedronFiveCompound", n}] for n=1, 2, 3.

Dodecahedron5CompoundsAndDuals

These dodecahedron 5-compounds are illustrated above together with their icosahedron 5-compound duals and common midspheres.

Dodecahedron5CompoundsIntersectionsAndConvexHulls

For the first compound, the common solid has the connectivity of the deltoidal hexecontahedron and the convex hull is the unnamed polyhedron illustrated above.

Dodecahedron5-CompoundNet

Nets for the dodecahedron 5-compound are shown above, where the lengths are given by

s_1=1/(11)(4-sqrt(5))
(2)
s_2=1/2sqrt(1/5(5-2sqrt(5)))
(3)
s_3=1/(22)sqrt(1/5(79+16sqrt(5)))
(4)
s_4=1/(44)sqrt(1/2(177+19sqrt(5)))
(5)
s_5=1/4sqrt(11-4sqrt(5))
(6)
s_6=1/4sqrt((11)/5)
(7)
s_7=1/2sqrt(1/5(9-2sqrt(5)))
(8)
s_8=1/5(5-sqrt(5))
(9)
s_9=1.
(10)

The compound hull has surface area

 S=3/(22)sqrt(102785-31078sqrt(5)) approx 24.8812.
(11)

See also

Icosahedron 5-Compound, Polyhedron Compound, Regular Dodecahedron

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References

Wenninger, M. J. Dual Models. Cambridge, England: Cambridge University Press, pp. 145-147, 1983.

Cite this as:

Weisstein, Eric W. "Dodecahedron 5-Compound." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Dodecahedron5-Compound.html

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