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Koj yuav daws li cas rau ob daim duab peb sab?
Koj yuav daws li cas rau ob daim duab peb sab?

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Video: Koj yuav daws li cas rau ob daim duab peb sab?
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Kev daws SSA Daim duab peb sab

  1. siv Txoj Cai ntawm Sines ua ntej los xam ib qho ntawm lwm tus ob kaum sab xis;
  2. tom qab ntawd siv peb lub kaum sab xis ntxiv rau 180 ° kom pom lwm qhov lub kaum sab xis ;
  3. Thaum kawg siv Txoj Cai ntawm Sines dua kom pom qhov tsis paub.

Tsuas yog li ntawd, koj yuav nrhiav tau qhov kev daws thib 2 ntawm daim duab peb sab li cas?

Txhawm rau txiav txim siab seb puas muaj 2 lub kaum sab xis siv tau:

  1. Saib seb koj puas tau muab ob sab thiab lub kaum sab xis tsis nyob nruab nrab (SSA).
  2. Nrhiav tus nqi ntawm lub kaum sab xis tsis paub.
  3. Thaum koj pom tus nqi ntawm koj lub kaum sab xis, rho tawm ntawm 180 ° kom pom lub kaum sab xis thib ob.
  4. Ntxiv lub kaum sab xis tshiab rau lub kaum sab xis qub.

Tsis tas li ntawd, ua li cas rau koj nrhiav thaj tsam ntawm daim duab peb sab? Rau nrhiav tus cheeb tsam ntawm a daim duab peb sab , muab lub hauv paus los ntawm qhov siab, thiab muab faib los ntawm 2. Kev faib los ntawm 2 los ntawm qhov tseeb tias ib qho parallelogram tuaj yeem muab faib ua 2 daim duab peb sab . Piv txwv li, nyob rau hauv daim duab mus rau sab laug, lub cheeb tsam ntawm txhua tus daim duab peb sab yog sib npaug rau ib nrab ntawm cheeb tsam ntawm parallelogram.

Nyob rau hauv no hais txog, Heron lub cheeb tsam formula yog dab tsi?

Hauv geometry, Heron tus qauv (qee zaus hu ua Hero's qauv ), lub npe hu ua Hero of Alexandria, muab lub cheeb tsam ntawm ib daim duab peb sab thaum qhov ntev ntawm tag nrho peb sab paub. Tsis zoo li lwm daim duab peb sab cheeb tsam formulae, tsis tas yuav suav cov ces kaum lossis lwm qhov kev ncua deb hauv daim duab peb sab ua ntej.

Cpctc sawv cev rau dab tsi?

qhov sib thooj ntawm daim duab peb sab congruent yog congruent

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