Abstract: Lub dodecahedron yog ib qho zoo nkauj ua los ntawm 12 pentagons tsis tu ncua. Nws tsis tshwm sim hauv qhov; nws tau tsim los ntawm Pythagoreans, thiab peb tau nyeem nws thawj zaug hauv cov ntawv sau los ntawm Plato.
Vim li cas thiaj hu ua dodecahedron?
Dodecahedron yog los ntawm Greek lo lus "dōdeka" txhais tau tias "12" thiab "hédra" txhais tau tias "lub ntsej muag lossis lub rooj" uas qhia tau tias nws yog polyhedron nrog 12 sab lossis 12 lub ntsej muag Li no, ib qho polyhedra nrog 12 sab tuaj yeem hu ua dodecahedron. Nws yog tsim los ntawm 12 lub ntsej muag pentagonal.
Vim li cas lub dodecahedron tshwj xeeb?
Thaum lub dodecahedron ib txwm muaj ntau yam nta nrog lwm cov khoom Platonic, ib qho khoom tshwj xeeb ntawm nws yog ib tus tuaj yeem pib ntawm kaum ntawm qhov chaw thiab kos tus lej tsis kawg ntawm txoj kab ncaj nraim hla daim duab uas rov qab mus rau qhov qub tsis tau hla lwm lub ces kaum.
Leej twg nrhiav tau lub dodecahedron?
Thaum Hippasus ntawm Metapontum (uas tau lees paub nrog kev tshawb pom dodecahedron) tau nthuav tawm qhov zais cia ntawm qhov muaj qhov tsis sib haum xeeb, nws raug pov rau hauv dej thiab poob dej. Phi, nthuav tawm txog 20,000 qhov chaw yog luam tawm rau saum npoo ntawm daim duab.
dodecahedron yog dab tsi?
Ib txwm dodecahedron lossis pentagonal dodecahedron yog dodecahedron uas tsis tu ncua, uas yog tsim los ntawm 12 lub ntsej muag pentagonal, peb lub rooj sib tham ntawm txhua qhov vertex Nws yog ib qho ntawm tsib Platonic solids. Nws muaj 12 lub ntsej muag, 20 vertices, 30 npoo, thiab 160 kab pheeb ces kaum (60 lub ntsej muag kab pheeb ces kaum, 100 qhov chaw kab pheeb ces kaum).
