Cov txheej txheem:
Video: Koj pom qhov piv txwv ntawm thaj chaw li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Piv txwv . Hauv cov lus, cov thaj chaw saum npoo ntawm ib lub kub cheeb tsam ntawm rau lub squares uas npog nws. Cov cheeb tsam ib tug ntawm lawv yog a * a, los yog a 2. Txij li cov no yog tag nrho tib yam, koj tuaj yeem muab ib qho ntawm lawv los ntawm rau, yog li cov thaj chaw saum npoo ntawm ib lub voos xwmfab yog 6 npaug ntawm ib sab squared.
Tom qab ntawd, ib tug kuj yuav nug, koj yuav nrhiav tau thaj tsam li cas?
Yuav ua li cas nrhiav thaj tsam ntawm Rectangular Prisms:
- Nrhiav thaj tsam ntawm ob sab (Length * Qhov siab) * 2 sab.
- Nrhiav thaj tsam ntawm sab uas nyob ib sab (Dav * Qhov siab) * 2 sab.
- Nrhiav thaj tsam ntawm qhov kawg (Length * Dav) * 2 kawg.
- Ntxiv peb qhov chaw ua ke kom pom thaj chaw saum npoo av.
- Piv txwv li: Qhov chaw saum npoo ntawm ib daim duab plaub prism 5 cm ntev, 3 cm.
Ib tug kuj yuav nug, dab tsi yog tus qauv ntawm ib cheeb tsam? Cov qauv nyob ntawm seb hom khoom puas. Qhov chaw saum npoo ntawm ib tus kheej kheej: A = 4πr², qhov twg r stands rau lub vojvoog ntawm tus kheej. Qhov chaw saum npoo ntawm ib lub voos xwmfab: A = 6a², qhov twg a yog qhov ntev. Qhov chaw saum npoo ntawm lub tog raj kheej: A = 2πr² + 2πrh, qhov twg r yog lub vojvoog thiab h yog qhov siab ntawm lub tog raj kheej.
Ua raws li qhov xav tau, qhov piv txwv ntawm thaj chaw saum npoo yog dab tsi?
Qhov chaw saum npoo Cov ntsiab lus txhais rau piv txwv , ib tug kheej kheej thiab ib lub voos xwmfab yog peb-dimensional, tab sis lub voj voog thiab ib square tsis yog. Lub voos xwmfab yog ib qho prism, tab sis ib tug kheej kheej tsis yog. Lub prism muaj ob sab ntawm qhov sib txuam, hu ua lub hauv paus, zoo li lub voos xwmfab, daim duab peb sab prism thiab cov duab plaub.
Yuav ua li cas yog tus qauv los nrhiav qhov chaw ntawm lub tog raj kheej?
Txhawm rau nrhiav thaj chaw saum npoo ntawm lub tog raj kheej add cov thaj chaw saum npoo ntawm txhua qhov kawg ntxiv rau thaj chaw saum npoo ntawm sab. Txhua kawg yog ib lub voj voog ces tus thaj chaw saum npoo ntawm txhua qhov kawg yog π * r2, qhov twg r yog lub vojvoog ntawm qhov kawg. Muaj ob qhov kawg kom lawv sib xyaw thaj chaw saum npoo yog 2p*r2.
Pom zoo:
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