2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
"ib daim duab uas khi los ntawm yim lub dav hlau ntsej muag, " 1560s, los ntawm Greek oktahedron, neuter ntawm oktahedros "yim-sided," los ntawm okta- "yim" (saib octa -) + hedra "lub rooj; lub ntsej muag ntawm cov khoom geometrical, "los ntawm PIE hauv paussed- (1) "to zaum." Related: Octahedral.
Vim li cas thiaj hu ua octahedron?
Lo lus octahedron yog muab los ntawm Greek lo lus 'Oktaedron' uas txhais tau tias 8 ntsib. Ib qho octahedron yog polyhedron nrog 8 lub ntsej muag, 12 npoo, thiab 6 ntsug thiab ntawm txhua qhov vertex 4 npoo sib ntsib.
lo lus octahedron txhais li cas?
: a khoom khi los ntawm yim lub dav hlau ntsej muag.
Vim li cas octagonal pyramid hu ua octahedron?
Hauv geometry, ib qho octahedron (plural: octahedra, octahedrons) yog polyhedron nrog yim lub ntsej muag, kaum ob ntug, thiab rau vertices. Lo lus feem ntau yog siv los xa mus rau qhov tsis tu ncua octahedron, Platonic cov khoom tsim los ntawm yim daim duab peb sab sib npaug, plaub qhov sib ntsib ntawm txhua qhov vertex.
Lwm lub npe ntawm octahedron yog dab tsi?
Nyob rau hauv nplooj ntawv no koj tuaj yeem nrhiav tau 8 lub ntsiab lus, cov lus qhia, cov lus qhia, thiab cov lus hais txog octahedron, xws li: equilateral, icosahedron, dodecahedron, tetrahedra, octahedra, stellate, polyhedron thiab equilateral-daim duab peb sab.
Pom zoo:
Qhov twg hauv qab no yog qhov lus piav qhia zoo tshaj plaws ntawm lo lus realpolitik?
Realpolitik is kev nom kev tswv raws li kev xav tau ntawm lub xeev . Lub hwj chim tseem ceeb dua li txoj cai lossis kev ntseeg tswj hwm tus kheej tus cwj pwm. … Lub hwj chim tseem ceeb dua txoj cai lossis kev ntseeg uas tswj hwm tus kheej tus cwj pwm.
Qhov twg yog qhov zoo tshaj plaws piav qhia lub ntsiab lus ntawm lo lus theorem?
1: ib qho qauv, kev pom zoo, lossis nqe lus hauv lej lossis logic txiav lossis txiav tawm los ntawm lwm cov qauv lossis cov lus pom zoo. 2: ib lub tswv yim lees txais los yog npaj ua qhov tseeb feem ntau ua ib feem ntawm txoj kev xav dav dav:
Thaum twg siv octahedron?
Tsuas yog ob peb lub lis piam cov menyuam mos lub qhov muag tau npaj rau qhov kev sib tw pom tom ntej, uas yog Montessori Octahedron mobile. Koj tuaj yeem qhia nws rau cov menyuam mos 5-8 lub lis piam lossis txog thaum lawv nyiam saib. Thaum twg kuv yuav tsum qhia kuv lub xov tooj octahedron?
Lo lus hais qhov rooj tuaj qhov twg?
Lwm lo lus rau kev tsav tsheb yog lo lus lub qhov rooj, uas yog siv hauv New England, feem ntau hauv Maine, raws li Martha Barnette, tus tswv cuab ntawm xov tooj cua qhia A Way With Words. Merriam-Webster's Online Dictionary hais tias lub qhov rooj yog thawj zaug siv nyob rau hauv 1764, xa mus rau lub vaj nyob ib sab ntawm lub qhov rooj.
Qhov nyiaj ntawm qhov ntswg tuaj qhov twg?
Thaum cov Danes tau kov yeej Ireland nyob rau xyoo pua cuaj, lawv tau suav suav suav "suav qhov ntswg". Cov nqi se ntau dhau tau raug them rau txhua "lub qhov ntswg", yog li ib tus yuav tsum tau them los ntawm lub qhov ntswg.
