Grande rombicosidodecaedro stellato

Grande rombicosidodecaedro stellato
TipoPoliedro stellato uniforme
Forma facce20 triangoli
30 quadrati
12 pentagrammi
Nº facce62
Nº spigoli120
Nº vertici60
Caratteristica di Eulero2
Incidenza dei vertici3.4.5/3.4
Notazione di Wythoff5/3 3 | 2
5/2 3/2 | 2
Notazione di Schläflirr{5/3,3}
Diagramma di Coxeter-Dynkin
Gruppo di simmetriaIh, [5,3], *532
DualeGrande esacontaedro trapezoidale
ProprietàNon convessità
Politopi correlati
Figura al vertice
Poliedro duale

In geometria, il grande rombicosidodecaedro stellato è un poliedro stellato uniforme avente 62 facce - 20 triangolari, 30 quadrate e 12 forma di pentagramma - 120 spigoli e 60 vertici.[1]

Costruzioni di Wythoff

Utilizzando la costruzione di Wythoff, il grande rombicosidodecaedro stellato si può ottenere utilizzando tre famiglie di triangoli di Schwarz: 5/3 3 | 2 e 5/2 3/2 | 2, ottenendo sempre lo stesso risultato.

Coordinate cartesiane

Le coordinate cartesiane per i vertici del grande rombicosidodecaedro stellato sono date da tutte le permutazioni pari di:

dove è la sezione aurea.

Poliedri correlati

Il grande rombicosidodecaedro stellato, spesso indicato con il simbolo U67, ha la stessa disposizione di vertici di altri tre poliedri uniformi, ossia il grande dodecicosidodecaedro, il grande dodecaedro troncato e il grande rombidodecaedro, nonché di altri due composti uniformi, ossia il composto di sei prismi pentagonali e il composto di dodici prismi pentagonali. Con il grande grande dodecicosidodecaedro e con il grande rombidodecaedro, esso condivide anche la posizione degli spigoli, avendo in comune con il primo anche la disposizione delle sue facce triangolari e pentagrammiche, e con il secondo quella delle sue facce quadrate.


Grande rombicosidodecaedro stellato

Grande dodecicosidodecaedro

Grande rombidodecaedro

Grande dodecaedro troncato

Composto di sei prismi pentagonali

Composto di dodici prismi pentagonali

Grande esacontaedro trapezoidale

Grande esacontaedro trapezoidale
TipoPoliedro stellato
Forma facceAquiloni
Nº facce60
Nº spigoli120
Nº vertici62
Caratteristica di Eulero2
Gruppo di simmetriaIh, [5,3], *532
DualeGrande rombicosidodecaedro stellato

Il grande esacontaedro trapezoidale è un poliedro stellato isoedro, nonché il duale del grande rombicosidodecaedro stellato, avente per facce 60 dardi, detti anche aquiloni non convessi.[2]

Dato un grande rombicosidodecaedro stellato di spigolo pari a 1, immaginando il grande esacontaedro trapezoidale come composto da 60 facce a forma di dardi intersecanti, come riportato nella figura sottostante, di cui solo una parte visibile all'esterno del solido, i due angoli uguali di tali facce, ossia i due angoli acuti, risultano avere un'ampiezza di , mentre gli altri misurano e . I lati corti delle facce risultano invece misurare e i lunghi .

Note

  1. ^ Roman Maeder, 67: great rhombicosidodecahedron, su Mathconsult. URL consultato il 24 marzo 2024.
  2. ^ Magnus J. Wenninger, Dual Models, Cambridge University Press, 2004, pp. 88. URL consultato il 20 marzo 2024.

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