Lo lus 'polyhedron' los ntawm ob lo lus Greek, poly txhais tau ntau, thiab hedron hais txog qhov chaw. … Txhua lub polyhedron muaj peb ntu: Lub ntsej muag: lub tiaj tiaj uas ua ib lub polyhedron hu ua nws lub ntsej muag. Cov ntsej muag no yog polygons tsis tu ncua.
Yuav ua li cas polyhedrons hu ua?
Feem ntau, polyhedrons yog npe raws li tus naj npawb ntawm lub ntsej muag Ib lub tetrahedron muaj plaub lub ntsej muag, lub pentahedron tsib, thiab lwm yam; ib lub voos xwmfab yog ib tug rau-sided tsis tu ncua polyhedron (hexahedron) uas nws lub ntsej muag yog squares. Lub ntsej muag sib ntsib ntawm kab ntu hu ua ntug, uas sib ntsib ntawm cov ntsiab lus hu ua vertices.
Vim li cas lub sphere tsis yog polyhedron?
Non-polyhedrons yog cones, spheres, thiab cylinders vim lawv muaj ob sab uas tsis yog polygons. Lub prism yog ib tug polyhedron nrog ob lub hauv paus congruent, nyob rau hauv parallel dav hlau, thiab lateral sab yog cov duab plaub.
Puas yog lub thawv Ib qho piv txwv ntawm polyhedra?
Ib lub polyhedron nrog rau lub duab plaub raws li ob sab kuj muaj ntau lub npe-ib lub voj voog parallelepided, rectangular prism, lossis lub thawv.
Yuav ua li cas yog polyhedron?
Nyob hauv geometry, ib lub polyhedron yog tsuas yog cov khoom peb-dimensional uas muaj cov khoom sib sau ua ke, feem ntau koom nrog lawv cov npoo Lo lus muab los ntawm Greek poly (ntau) ntxiv rau Indo-European hedron (lub rooj). … Lub plural ntawm polyhedron yog "polyhedra" (los yog qee zaum "polyhedrons").
