Video: Yuav ua li cas muaj pes tsawg tus ntug polyhedron uas muaj plaub lub ntsej muag thiab plaub vertices?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Yog hais tias cov khoom yog polyhedron, npe nws thiab nrhiav tus naj npawb ntawm lub ntsej muag, ntug thiab vertices nws muaj. Lub hauv paus yog daim duab peb sab thiab txhua sab yog daim duab peb sab, yog li qhov no yog daim duab peb sab pyramid, uas tseem hu ua tetrahedron. Muaj 4 lub ntsej muag, 6 ntug thiab 4 kab.
Ua kom pom qhov no, pes tsawg lub ntsej muag thiab cov npoo puas muaj polyhedron?
Lub polyhedron no muaj 12 lub ntsej muag, 20 rov , thiab 30 ntug.
Lub pyramid nrog 4 lub ntsej muag hu ua dab tsi? Lub tetrahedron yog ib hom pyramid , uas yog ib tug polyhedron nrog lub tiaj polygon puag thiab daim duab peb sab ntsej muag txuas lub hauv paus mus rau ib qho kev taw qhia. Nyob rau hauv cov ntaub ntawv ntawm tetrahedron lub hauv paus yog daim duab peb sab (ib yam ntawm plaub lub ntsej muag tuaj yeem suav hais tias yog lub hauv paus), yog li tetrahedron tseem hu ua "daim duab peb sab pyramid ".
Ua raws li qhov no hauv kev txiav txim siab, puas muaj polyhedron muaj 4 lub ntsej muag?
Hauv geometry, a polyhedron yog ib qho khoom hauv peb qhov loj me nrog lub tiaj ntsej muag thiab cov npoo ncaj. Txhua ntug muaj raws nraim ob ntsej muag , thiab txhua vertex yog surrounded los ntawm alternating ntsej muag thiab ntug. Qhov tsawg tshaj plaws polyhedron yog tetrahedron nrog 4 daim duab peb sab ntsej muag ,, 6 yuv 4 ntsug.
Puas muaj polyhedron muaj 20 lub ntsej muag 40 npoo thiab 30 ntsug?
Tsis yog, as 20 + 30 - 40 tsis sib npaug 2. yog li tsis muaj polygon nrog 20 fim , 40 ntug thiab 30 vertices.
Pom zoo:
Muaj pes tsawg lub vertices ib lub hauv paus puas Heptagonal prism muaj?
Teb thiab piav qhia: Lub heptagonal prism muaj 14 vertices. Ib tug heptagonal prism yog ib tug prism nyob rau hauv uas lub hauv paus yog heptagons, los yog polygons nrog xya sab thiab xya vertices
Lub cylinder muaj pes tsawg lub ntsej muag?
3 fim Tsis tas li ntawd, lub tog raj kheej puas muaj lub ntsej muag? Tag nrho cov duab no yog nkhaus hauv qee way, zoo tsis muaj ntug los yog vertices. Yuav ua li cas txog lawv ntsej muag ? Ib tug kheej kheej tsis muaj ntsej muag ,ib cone muaj ib ncig ntsej muag , thiab a cylinder muaj ob lub voj voog ntsej muag .
Lub ntsej muag zoo li cas muaj 5 lub ntsej muag?
Hauv geometry, pentahedron (plural: pentahedra) yog polyhedron nrog tsib lub ntsej muag lossis sab. Tsis muaj lub ntsej muag-transitive polyhedra nrog tsib sab thiab muaj ob hom topological txawv. Nrog lub ntsej muag polygon tsis tu ncua, ob daim ntawv topological yog cov square pyramid thiab triangular prism
Yuav ua li cas yog qhov tshwm sim uas ib tug poj niam dig muag xim uas yuav ib tug txiv neej uas tsis pom kev zoo yuav muaj xim dig muag me nyuam?
Yog tias tus poj niam uas muaj lub zeem muag zoo li no (heterozygous rau qhov muag tsis pom xim) yuav ib tug txiv neej ib txwm muaj (XY), cov xeeb ceem hauv qab no tuaj yeem xav tau hauv F2 tiam: ntawm cov ntxhais, 50% yog ib txwm muaj thiab 50% yog cov neeg nqa khoom rau cov kab mob; ntawm cov tub, 50% yog xim dig muag thiab 50% yog qhov pom kev zoo
Koj pom thaj tsam ntawm lub ntsej muag siv lub ntsej muag li cas?
Qhov chaw saum npoo yog qhov sib npaug ntawm thaj chaw ntawm txhua lub ntsej muag (lossis qhov chaw) ntawm 3D duab. Ib lub cuboid muaj 6 lub ntsej muag. Txhawm rau nrhiav thaj chaw saum npoo ntawm lub cuboid, ntxiv cov cheeb tsam ntawm tag nrho 6 lub ntsej muag. Peb tseem tuaj yeem sau qhov ntev (l), dav (w), thiab qhov siab (h) ntawm lub prism thiab siv cov qauv, SA = 2lw + 2lh + 2hw, txhawm rau nrhiav thaj chaw saum npoo