Video: Dab tsi yog lub vas ntawm daim duab peb sab pyramid?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov net ntawm daim duab peb sab pyramid muaj plaub daim duab peb sab. Lub hauv paus ntawm pyramid yog a daim duab peb sab , thiab lub ntsej muag lateral kuj yog daim duab peb sab. Cov net ntawm cov duab plaub pyramid muaj ib daim duab plaub thiab plaub daim duab peb sab.
Raws li txoj cai, koj yuav ua li cas thiaj nrhiav tau tag nrho thaj chaw ntawm daim duab peb sab pyramid?
Rau nrhiav tus thaj chaw saum npoo ntawm ib txwm daim duab peb sab pyramid , peb siv lub qauv SA = A +(3/2)bh, where A = the cheeb tsam ntawm cov pyramid puag, b = lub hauv paus ntawm ib lub ntsej muag, thiab h = qhov siab ntawm ib lub ntsej muag.
Tom qab ntawd, lo lus nug yog, dab tsi yog tus qauv rau tag nrho thaj tsam ntawm daim duab peb sab prism? Formulas Koj yuav tau ua kom tiav cov lus qhia no
| Cov duab | Formula |
|---|---|
| Thaj tsam ntawm ib daim duab peb sab | A = 1/2 ib |
| Thaj tsam ntawm ib daim duab plaub | A = lwb |
| Qhov chaw ntawm daim duab peb sab prism | SA = bh + (s1 + s2 + s3)H |
Tsis tas li ntawd, lub vas ntawm daim duab peb sab prism yog dab tsi?
Cov net ntawm ib daim duab peb sab prism muaj ob daim duab peb sab thiab peb daim duab plaub. Cov duab peb sab yog cov hauv paus ntawm cov prism thiab cov duab plaub yog lub ntsej muag tom qab.
Tag nrho thaj tsam ntawm lub pyramid yog dab tsi?
Cov Qhov chaw ntawm lub Pyramid Thaum txhua sab ntsej muag zoo ib yam: [Paj Thaj chaw ] +1/2 × Perimeter × [SlantLength]
Pom zoo:
Dab tsi yog equidistant los ntawm peb sab ntawm daim duab peb sab?
Lub ntsiab lus uas sib npaug rau txhua sab ntawm daim duab peb sab yog hu ua incenter: Ib qho nruab nrab yog ib qho kab uas muaj ib qho ntawm nws qhov kawg ntawm lub vertex ntawm daim duab peb sab thiab lwm qhov kawg ntawm qhov nruab nrab ntawm sab opposite lub vertex. Peb qhov nruab nrab ntawm ib daim duab peb sab sib ntsib hauv centroid
Koj tuaj yeem ua pov thawj li cas 2 daim duab peb sab zoo sib xws siv lub kaum sab xis sab SAS zoo sib xws postulate?
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Nws hloov tawm tias tag nrho peb qhov siab ib txwm sib tshuam ntawm tib lub ntsiab lus - lub npe hu ua orthocenter ntawm daim duab peb sab. Lub orthocenter tsis yog ib txwm nyob hauv daim duab peb sab. Yog tias daim duab peb sab yog obtuse, nws yuav nyob sab nraud. Txhawm rau ua kom qhov no tshwm sim cov kab qhov siab yuav tsum tau txuas ntxiv kom lawv hla
Dab tsi yog qhov txawv ntawm lub xeev daim duab kos duab thiab daim duab ua haujlwm?
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Dab tsi yog kev sib raug zoo ntawm sab nrauv thiab sab hauv lub kaum sab xis ntawm daim duab peb sab?
Cov kaum sab hauv yog hu ua Sab hauv cov ces kaum. Cov lej ntawm cov kaum sab hauv ntawm daim duab peb sab yog ib txwm 180 degrees. Lub kaum sab nrauv yog lub kaum sab xis ntawm ib sab ntawm ib qho duab, thiab ib txoj kab txuas ntxiv los ntawm sab tom ntej. Qhov sib npaug ntawm lub kaum sab nrauv thiab nws lub kaum sab hauv uas nyob ib sab kuj yog 180 degrees