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Koj ua li cas rau qhov chaw saum npoo?
Koj ua li cas rau qhov chaw saum npoo?

Video: Koj ua li cas rau qhov chaw saum npoo?

Video: Koj ua li cas rau qhov chaw saum npoo?
Video: ua kom poj niam los kua ntau yuav ua cas 2024, Kaum ib hlis
Anonim

Qhov chaw saum npoo yog qhov sum ntawm thaj chaw ntawm tag nrho cov ntsej muag (los yog nto ) ntawm 3D duab. Ib lub cuboid muaj 6 lub ntsej muag. Yuav nrhiav tau thaj chaw saum npoo ntawm ib cuboid, addthe thaj chaw ntawm tag nrho 6 lub ntsej muag. Peb kuj ua tau daim ntawv lo qhov ntev (l), dav (w), thiab qhov siab (h) ntawm lub prism thiab siv theformula, SA = 2lw + 2lh + 2hw, los nrhiav qhov thaj chaw saum npoo.

Ua li no, koj yuav nrhiav tau thaj tsam li cas?

Yuav ua li cas nrhiav thaj tsam ntawm RectangularPrisms:

  1. Nrhiav thaj tsam ntawm ob sab (Length * Qhov siab) * 2 sab.
  2. Nrhiav thaj tsam ntawm sab uas nyob ib sab (Dav * Qhov siab) * 2 sab.
  3. Nrhiav thaj tsam ntawm qhov kawg (Length * Dav) * 2 kawg.
  4. Ntxiv peb thaj chaw ua ke kom pom thaj chaw saum npoo av.
  5. Piv txwv li: Qhov chaw saum npoo ntawm ib daim duab plaub prism 5 cm ntev, 3cm.

Ib tug kuj yuav nug, yog qhov chaw saum npoo squared los yog cubed? Saib Tawm: thaj chaw saum npoo tsuas yog ob-dimensionaland yog qhia raws li units squared , tsis units kub . Qhov no yog vim peb tsuas yog cuam tshuam nrog cov chaw tiaj tus, tsis yog qhov chaw sab hauv.

Ntxiv rau qhov no, thaj chaw saum npoo yog dab tsi hauv lej txhais?

Tag nrho cheeb tsam ntawm nto ntawm cov khoom peb-dimensional. Piv txwv: lub thaj chaw saum npoo ntawm acube yog cheeb tsam ntawm tag nrho 6 lub ntsej muag ntxiv ua ke.

Yuav ua li cas koj ua hauj lwm tawm thaj tsam ntawm ib tug prism?

Cov thaj chaw saum npoo ntawm tej prism yog tag nrho cheeb tsam ntawm tag nrho nws sab thiab ntsej muag. Ib daim duab peb sab prism muaj peb lub kaum sab xis thiab ob lub ntsej muag daim duab peb sab. Yuav nrhiav tau cheeb tsam ntawm cov duab plaub sab, siv cov qauv A = lw, where A = cheeb tsam , l = ntev, thiab h = qhov siab.

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