Video: Puas yog tetrahedron Ib txwm polyhedron?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
A tetrahedron yog a polyhedron nrog 4 daim duab peb sab raws li nws lub ntsej muag. Tsis tu ncua polyhedra yog uniform thiab muaj ntsej muag ntawm txhua yam ntawm ib hom congruent tsis tu ncua polygon. Muaj tsib tsis tu ncua polyhedra . Cov tsis tu ncua polyhedra yog ib feem tseem ceeb ntawm Plato lub ntuj lub tswv yim, thiab yog li tau los hu ua Platonic Solids.
Yog li ntawd, uas yog ib txwm polyhedron?
A tsis tu ncua polyhedron yog a polyhedron uas pab pawg symmetry ua transitively ntawm nws cov chij. A tsis tu ncua polyhedron yog symmetrical heev, yog tag nrho ntawm ntug-transitive, vertex-transitive thiab ntsej muag-transitive. Tsis tas li ntawd, muaj tsib tsis tu ncua compounds ntawm cov tsis tu ncua polyhedra.
Tsis tas li ntawd, vim li cas tetrahedron yog polyhedron? Zoo li tag nrho cov pyramids, lub tetrahedron yog a polyhedron (piv txwv li peb-dimensional geometrical duab nrog lub ntsej muag tiaj tus thiab cov npoo ncaj). Nws muaj plaub (4) ntsej muag (lo lus tetra muaj nws keeb kwm hauv cov lus Greek, thiab txhais tau tias plaub), rau (6) ntug, thiab plaub (4) vertices.
Tsis tas li ntawd, puas yog daim duab peb sab prism ib txwm polyhedron?
Hauv geometry, a daim duab peb sab prism yog peb sab prism ; nws yog a polyhedron ua a daim duab peb sab lub hauv paus, ib daim ntawv txhais lus, thiab 3 lub ntsej muag koom nrog sab nraud. Ib txoj cai daim duab peb sab prism muaj cov duab plaub sab, txwv tsis pub nws yog oblique. Tag nrho cov kab sib txuas mus rau lub hauv paus ntsej muag yog tib yam daim duab peb sab.
Dab tsi yog 20 sided polyhedron hu ua?
Lo lus tsis tu ncua qhia tias lub ntsej muag thiab cov duab vertex yog cov polygons tsis tu ncua, piv txwv li, kom paub qhov txawv ntawm cov dodecahedron tsis tu ncua (uas yog Platonic khoom) los ntawm ntau dodecahedra. Ib yam li ntawd, icosi-, lub ntsiab lus 20 , yog siv nyob rau hauv 20 - sab icosahedron, illustrated ntawm txoj cai.
Pom zoo:
Puas yog dilations ib txwm nce qhov ntev ntawm kab ntu?
Thaum lawv ntsuas qhov nrug ntawm cov ntsiab lus, dilations tsis hloov lub kaum sab xis. Kev hloov pauv cuam tshuam rau txhua lub ntsiab lus hauv lub dav hlau, tsis yog cov duab tshwj xeeb uas peb xaiv los txheeb xyuas thaum ua haujlwm nrog kev hloov pauv. Txhua qhov ntev ntawm kab ntu hauv lub dav hlau yog ntsuas los ntawm tib yam thaum peb siv dilation
Puas yog cov lej ib txwm muaj qee zaum lossis tsis muaj tus lej sib piv?
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Puas yog theem hloov pauv ib txwm hloov lub cev?
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Puas yog qhov tseem ceeb tshaj plaws ib txwm muaj?
Cov yam ntxwv tseem ceeb tsis yog ib txwm muaj ntau tshaj plaws. Qee tus neeg yuav xav tias qhov tseem ceeb tshaj plaws yog qhov feem ntau yuav pom nyob rau hauv cov pej xeem, tab sis lo lus 'dominant' tsuas yog hais txog qhov tseeb tias allele tau qhia dua lwm tus allele. Ib qho piv txwv ntawm qhov no yog Huntington tus kab mob