Cov khoom tseem ceeb ntawm lub pyramid

Hauv kev tshaj tawm no, peb yuav xav txog cov khoom tseem ceeb ntawm lub pyramid (hais txog cov npoo sab, ntsej muag, sau thiab piav qhia hauv lub hauv paus ntawm lub voj voog), nrog rau lawv nrog cov duab kos duab kom pom kev zoo dua ntawm cov ntaub ntawv nthuav tawm.

Nco ntsoov: Peb tau tshuaj xyuas lub ntsiab lus ntawm lub pyramid, nws cov ntsiab lus tseem ceeb thiab ntau yam hauv, yog li peb yuav tsis nyob ntawm lawv hauv kev nthuav dav ntawm no.

Cov ntsiab lus

pyramid zog

Pyramid nrog sib npaug sab tav

Khoom Muaj Khoom 1

Tag nrho cov ces kaum ntawm sab ntug thiab lub hauv paus ntawm lub pyramid yog sib npaug.

Cov khoom tseem ceeb ntawm lub pyramid

∠ EAC = ∠ECA = ∠ EBD = ∠EDB = a

Khoom Muaj Khoom 2

Ib lub voj voog tuaj yeem piav qhia nyob ib puag ncig ntawm lub hauv paus ntawm lub pyramid, qhov chaw ntawm qhov chaw uas yuav ua ke nrog qhov projection ntawm sab saum toj mus rau nws lub hauv paus.

Cov khoom tseem ceeb ntawm lub pyramid

  • Point F - vertex projection E ntawm lub hauv paus ABCD; kuj yog qhov chaw ntawm lub hauv paus no.
  • R yog lub vojvoog ntawm lub voj voog ncig.

Lub ntsej muag ntawm lub pyramid yog inclined rau lub hauv paus ntawm tib lub kaum sab xis.

Khoom Muaj Khoom 3

Ib lub voj voog tuaj yeem sau rau ntawm lub hauv paus ntawm lub pyramid, qhov nruab nrab ntawm qhov sib txuam nrog qhov projection ntawm lub vertex mus rau lub hauv paus ntawm daim duab.

Cov khoom tseem ceeb ntawm lub pyramid

Khoom Muaj Khoom 4

Txhua qhov siab ntawm sab ntsej muag ntawm lub pyramid yog sib npaug rau ib leeg.

Cov khoom tseem ceeb ntawm lub pyramid

EL = EM = EN = EK

Nco ntsoov: rau cov khoom uas tau teev tseg saum toj no, cov qauv rov qab los kuj muaj tseeb. Piv txwv li, rau Khoom 1: yog tias tag nrho cov kaum sab xis ntawm sab ntug thiab lub dav hlau ntawm lub hauv paus ntawm lub pyramid yog sib npaug, ces cov npoo no muaj qhov ntev.

Sau ntawv cia Ncua