Yuav ua li cas koj xam qhov perimeter ntawm ib lub laj kab?
Yuav ua li cas koj xam qhov perimeter ntawm ib lub laj kab?

Video: Yuav ua li cas koj xam qhov perimeter ntawm ib lub laj kab?

Video: Yuav ua li cas koj xam qhov perimeter ntawm ib lub laj kab?
Video: Npawg Xeeb thiab Maiv Xis part2 Dab neeg Dab 4/28/2020 2024, Kaum ib hlis
Anonim

Koj tuaj yeem nrhiav tau ib puag ncig ntawm ib qho duab los ntawm kev ntxiv qhov ntev ntawm txhua sab ua ke. Sim nws! Ntaus qhov ntev ntawm txhua sab thiab ntxiv rau lawv mus nrhiav ib puag ncig . Mike thiab nws txiv ntxawm tseem xav tau koj kev pab mus nrhiav ib puag ncig ntawm vaj kom paub ntau npaum li cas laj kab mus yuav.

Ib yam li ntawd ib tug yuav nug, dab tsi yog tus qauv rau perimeter?

Cov mis rau lub perimeter ntawm a duab plaub feem ntau sau li P = 2l + 2w, qhov twg l yog qhov ntev ntawm tus duab plaub thiab w yog qhov dav ntawm lub duab plaub.

Kuj Paub, koj nrhiav thaj chaw li cas? Yuav nrhiav tau cheeb tsam ntawm ib daim duab plaub muab nws qhov siab los ntawm nws qhov dav. Rau ib lub square koj tsuas yog yuav tsum nrhiav qhov ntev ntawm ib sab (raws li txhua sab yog tib qhov ntev) thiab muab qhov no los ntawm nws tus kheej kom pom cov cheeb tsam.

Yuav ua li cas yog lub mis rau xam lub perimeter ntawm ib lub duab plaub?

Txhawm rau nrhiav qhov perimeter ntawm ib daim duab plaub, ntxiv rau ntev ntawm daim duab plaub plaub sab. Yog tias koj tsuas muaj qhov dav thiab qhov siab xwb, ces koj tuaj yeem yooj yim pom tag nrho plaub sab (ob sab yog sib npaug rau qhov siab thiab ob sab yog sib npaug ntawm qhov dav). Muab ob qhov siab thiab qhov dav los ntawm ob thiab ntxiv cov txiaj ntsig.

Qhov formula yog dab tsi?

Cov qauv hauv cheeb tsam yooj yim tshaj plaws yog cov qauv rau thaj tsam ntawm ib daim duab plaub. Muab ib daim duab plaub nrog ntev l thiab width w, formula for area is: A = lw (rectangle). Ntawd yog, thaj tsam ntawm daim duab plaub yog qhov ntev multiplied los ntawm qhov dav.

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