Tag nrho cov npoo ntawm lub tetrahedron ib txwm sib npaug ntawm qhov ntev thiab txhua lub ntsej muag ntawm lub tetrahedron yog sib npaug. Ib qho tetrahedron li niaj zaus kuj yog tetrahedron txoj cai. Ib qho oblique tetrahedron kuj yog ib qho tsis xwm yeem tetrahedron. Txhua lub ntsej muag yog daim duab peb sab sib npaug.
Puas yog txhua sab ntawm lub tetrahedron sib npaug?
Nyob rau hauv ib lub tetrahedron li niaj zaus, txhua lub ntsej muag yog tib yam loj thiab zoo li (congruent) thiab tag nrho cov npoo yog tib qhov ntev.
Cov khoom ntawm tetrahedron yog dab tsi?
Cov khoom ntawm tetrahedron yog:
- Nws muaj 4 lub ntsej muag, 6 ntug, thiab 4 lub ces kaum.
- Txhua plaub qhov chaw sib npaug sib nrug deb ntawm ib leeg hauv tetrahedron tsis tu ncua.
- Tsis zoo li lwm cov khoom platonic, nws tsis muaj lub ntsej muag sib luag.
- Ib txwm tetrahedron muaj tag nrho nws lub ntsej muag raws li daim duab peb sab sib npaug.
- Nws muaj 6 lub dav hlau sib luag.
Koj paub li cas tetrahedron?
A tetrahedron yog peb-dimensonal daim duab uas txhua sab yog daim duab peb sab sib npaugYog li ntawd, txhua lub kaum sab xis hauv daim duab peb sab yog. Hauv daim duab, peb paub tus nqi ntawm sab thiab tus nqi ntawm lub hauv paus. Txij li thaum faib daim duab peb sab los ntawm ib nrab tsim ib daim duab peb sab, peb paub tus nqi ntawm yuav tsum yog.
Lub kaum sab xis ntawm ob lub ntsej muag ntawm tetrahedron yog dab tsi?
2 Teb Los Ntawm Cov Kws Qhia Ntawv
Lub kaum sab xis ntawm 2 ntug yog 60 degrees, tab sis lub kaum sab xis ntawm 2 lub ntsej muag kuv tau txais 70.529 degrees.
