Fold R thiab S mus txog qhov nruab nrab kab EO, kom lawv sib ntsib los ua ib txoj kab ncaj nraim thiab ua ib lub pentagon. Yog koj ua 12 pentagons li no thiab sib sau ua ke, siv koj 'flaps' thiab 'pockets', koj tuaj yeem ua ib lub dodecahedron.
Dab tsi tshwj xeeb ntawm dodecahedron?
Thaum cov 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 yam tsis tau hla lwm lub ces kaum
10 sab zoo li cas hu ua?
In geometry, a decagon (los ntawm Greek δέκα déka thiab γωνία gonía, "kaum kaum") yog kaum-sided polygon lossis 10-gon. Tag nrho cov lej ntawm cov kaum sab hauv ntawm ib qho yooj yim decagon yog 1440 °. Ib qho kev sib tshuam tus kheej tsis tu ncua yog lub npe hu ua decagram.
Puas yog dodecahedron Tessellate?
Lub rhombic dodecahedron tuaj yeem siv los ua tessellate qhov chaw peb sab: nws tuaj yeem muab tso rau hauv qhov chaw, zoo li hexagons sau lub dav hlau. Qhov no polyhedron nyob rau hauv qhov chaw-sau tessellation tuaj yeem pom raws li Voronoi tessellation ntawm lub ntsej muag-centered cubic lattice.
Pyramid 5 sab hu ua dab tsi?
Nyob hauv geometry, a pentagonal pyramid yog lub pyramid nrog lub hauv paus pentagonal raws li tau tsim tsib daim duab peb sab ntsej muag uas sib ntsib ntawm ib qho taw tes (lub vertex). Zoo li txhua lub pyramid, nws yog tus kheej-dual.
