txheem
Qhov kev tshaj tawm no nthuav tawm cov qauv uas tuaj yeem siv los nrhiav lub vojvoog ntawm lub pob (sphere) sau rau hauv lub pyramid li niaj zaus: daim duab peb sab, plaub fab, hexagonal thiab tetrahedron.
Formulas rau xam lub vojvoog ntawm ib lub pob (sphere)
Cov ntaub ntawv hauv qab no tsuas yog siv rau . Cov mis rau kev nrhiav lub vojvoog nyob ntawm hom daim duab, xav txog cov kev xaiv ntau tshaj plaws.
Tsis tu ncua daim duab peb sab pyramid
Ntawm daim duab:
- a - ntug ntawm lub hauv paus ntawm lub pyramid, piv txwv li lawv yog sib npaug ntu AB, AC и BC;
- DE - qhov siab ntawm lub pyramid (h).
Yog tias qhov tseem ceeb ntawm cov khoom no paub, ces nrhiav lub vojvoog (r) inscribed pob/sphere tuaj yeem muab los ntawm tus qauv:
Ib rooj plaub tshwj xeeb ntawm daim duab peb sab pyramid tsis tu ncua yog qhov tseeb. Rau nws, tus qauv rau kev nrhiav lub vojvoog yog raws li nram no:
Tsis tu ncua quadrangular pyramid
Ntawm daim duab:
- a - ntug ntawm lub hauv paus ntawm lub pyramid, piv txwv li AB, BC, CD и AD;
- EF - qhov siab ntawm lub pyramid (h).
Radius (r) inscribed pob/sphere yog xam raws li nram no:
Tsis tu ncua hexagonal pyramid
Ntawm daim duab:
- a - ntug ntawm lub hauv paus ntawm lub pyramid, piv txwv li AB, BC, CD, DE, EF, OF;
- GL - qhov siab ntawm lub pyramid (h).
Radius (r) inscribed pob/sphere yog xam los ntawm tus qauv:
