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Video: Koj pom qhov siab ntawm lub thawv li cas thaum muab qhov chaw saum npoo?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Nrhiav Tej Yam Txog Ib Lub Thawv
- A lub thawv feem ntau yog characterized los ntawm nws qhov siab h, thiab nws qhov dav, W, thiab nws qhov ntev L.
- Qhov dav, qhov siab , thiab ntev a lub thawv tuaj yeem ua txhua yam tsis zoo.
- Qhov ntim, lossis qhov chaw nyob hauv a lub thawv yog h × W × L.
- Sab nraud thaj chaw saum npoo ntawm a lub thawv Luas = 2 (h × W) + 2 (h × L) + 2 (W × L)
Tsis tas li lo lus nug yog, koj yuav ua li cas pom qhov siab ntawm lub kaum sab xis ntawm lub kaum sab xis thaum muab qhov chaw saum npoo?
Rau nrhiav qhov siab ntawm ib lub prism nrog aknown ntim, siv lub qauv V = Ah, qhov twg V sib npaug ntim, Aequals the cheeb tsam ntawm ib sab, thiab h sib npaug qhov siab . Yog koj tsis muaj cheeb tsam , muab qhov dav thiab qhov ntev ntawm ib sab kom tau txais tus nqi ntawd.
Ib sab saum toj no, koj yuav pom qhov siab ntawm lub thawv li cas? Cov lus qhia txog cov thawv:
- Lub thawv feem ntau yog cim los ntawm nws qhov siab h, thiab nws qhov dav, W, thiab nws qhov ntev L.
- Qhov dav, qhov siab, thiab ntev ntawm ib lub thawv tuaj yeem sib txawv.
- Qhov ntim, lossis qhov chaw nyob hauv ib lub thawv yog h × W × L.
- Qhov chaw sab nraud ntawm lub thawv yog 2 (h × W) + 2 (h × L) + 2 (W × L)
Kuj paub yog, koj ua li cas xam qhov chaw saum npoo?
Qhov chaw saum npoo yog qhov sum ntawm thaj chaw ntawm txhua lub ntsej muag (lossis nto) ntawm 3D duab. Ib lub cuboid muaj 6 daim duab plaub. Yuav nrhiav tau thaj chaw saum npoo ntawm ib cuboid, ntxiv rau thaj chaw ntawm tag nrho 6 lub ntsej muag. Peb tseem tuaj yeem sau qhov ntev (l), dav (w), thiab qhov siab (h) ntawm lub prism thiab siv tus qauv, SA = 2lw + 2lh + 2hw, los nrhiav qhov thaj chaw saum npoo.
Yuav ua li cas koj pom qhov siab ntawm ib lub pyramid?
Volume (V) yog sib npaug rau ib feem peb ntawm lub hauv paus cheeb tsam multiplied los ntawm lub qhov siab (H). Lub hauv paus cheeb tsam yog sib npaug rau qhov ntev (L) multiplied by width (W). Yog li ntawd, V = 1/3 x (LxWxH). Extract cov qauv rau cov qhov siab ntawm ib daim duab plaub -raws li pyramid siv koj txoj kev paub txog algebra.
Pom zoo:
Yuav ua li cas koj pom lub kaum sab xis nruab nrab muab qhov chaw thiab lub vojvoog ntawm ib lub sector?
Kev txiav txim siab Central Angle Los ntawm Sector Area (πr2) × (central angle in degrees ÷ 360 degrees) = sector area. Yog hais tias lub hauv paus lub kaum sab xis ntsuas nyob rau hauv radians, lub mis hloov mus ua: sector cheeb tsam = r2 × (central kaum hauv radians ÷ 2). (θ ÷ 360 degree) × πr2. (52.3 ÷ 100π) × 360. (52.3 ÷ 314) × 360
Dab tsi yog qhov kev sib raug zoo ntawm thaj chaw saum npoo thiab ntim ntawm lub voos xwmfab?
Rau qhov cubes me dua qhov no, thaj chaw saum npoo yog ntau dua piv rau qhov ntim ntau dua li nws nyob hauv qhov loj dua (qhov ntim ntau dua piv rau thaj chaw saum npoo). qhia meej meej tias raws li qhov loj ntawm ib yam khoom nce (tsis hloov pauv), qhov piv txwv no txo qis
Yuav ua li cas koj nrhiav tau qhov chaw saum npoo ntawm ib qho khoom?
Txhawm rau nrhiav thaj chaw saum npoo ntawm lub prism (los yog lwm yam geometric khoom) peb qhib cov khoom zoo li lub thawv ntawv thiab flatten nws tawm kom pom tag nrho cov ntawv geometric. Txhawm rau nrhiav qhov ntim ntawm lub prism (nws tsis muaj teeb meem yog tias nws yog duab plaub lossis duab peb sab) peb muab cov cheeb tsam ntawm lub hauv paus, hu ua thaj tsam B, los ntawm qhov siab h
Yuav ua li cas koj nrhiav tau qhov chaw saum npoo thiab ntim ntawm ib lub voj voog?
Qhov chaw saum npoo = (2 • π • r²) + (2 • π • r • qhov siab) Qhov twg (2 • π • r²) yog thaj tsam ntawm 'kawg' thiab (2 • π • r • siab ) yog thaj chaw sab nraud ( thaj tsam ntawm 'sab')
Vim li cas qhov chaw saum npoo rau qhov sib piv ntawm qhov tseem ceeb?
Qhov chaw rau qhov ntim qhov piv yog qhov tseem ceeb vim tias, raws li lub hnub nyoog ntawm tes thiab tsim cov khoom tseem ceeb xws li cov proteins nws loj tuaj. Cell tau loj dua, yog li nws qhov ntim tau loj dua, tab sis hmoov tsis zoo li ntim, thaj chaw ntawm lub xov tooj tsis tau loj dua sai