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Eulero e i poliedri

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18<br />

Piccolo dodecaedro stellato<br />

poliedro regolare<br />

(Keplero 1571 – 1630, Poinsot 1777 - 1859<br />

le facce sono dodici pentagoni regolari stellati<br />

ogni lato è comune a due facce<br />

in ogni vertice concorrono cinque facce<br />

le facce si attraversano<br />

V = 12 F = 12 S = 30 V + F – S = - 6 <br />

‘ingenuamente’:<br />

V’ = 32 F’ = 60 S’ = 90 V’ + F’ – S’ = 2

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