Neocube – ikozaeder in tetraeder
Tale magnetna igračka – neocube, je kar zanimiva. In valjda, če se da sestaviti kocka, se da še kaj drugega. Recimo pravilni polieder z največ ploskvami – ikozaeder. In ostane ravno še toliko kroglic, da lahko sestavim še tetraeder. Kot je razvidno iz linkov, si je tetraeder že zaslužil svoje mesto v wikipediji, ikozaeder pa še ne :-(((( Vsaj ne v slovenščini, v nemščini so mu že namenili svoje mesto.
Na slikah je enkrat zraven osnovni trikotnik – ikozaeder je zgrajen iz 20ih, tetraeder pa štirih. 20 * 9 + 4 * 9 = 216 = 6 * 6 * 6 – kar je osnovni neocube. Sestavljanje samo je na začetku enostavno, po pet trikotnikov skupaj tvori zgornji in spodnji del. Srednji del pa se začne enostavno, nato pa se malce zakomplicira. Čeravno potem, ko sem zlagal tetraeder, se mi je začelo zdeti, da sem malce preveč kompliciral, in bi bilo verjetno tam kjer ni šlo, le malce obrniti trikotnik. Whatever. Bomo videli naslednjič.
Sedaj pa sledi še dodekaeder, pa fuzbalska žoga (pet in šest kotniki), pa morda še kaj. Samo ne danes :-)
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