Video: Yuav ua li cas koj xam qhov perimeter ntawm ib lub laj kab?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
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.
Pom zoo:
Yuav ua li cas koj xam qhov ncig ntawm lub ntiaj teb ntawm nws latitude?
Circumference ntawm lub voj voog yog sib npaug rau 2 π r qhov twg r yog nws lub vojvoog. Nyob rau hauv lub ntiaj teb no, lub circumference ntawm tus kheej ntawm ib tug muab latitude yog 2πr(cos θ) qhov twg θ yog lub latitude thiab r yog lub vojvoog ntawm lub ntiaj teb ntawm kab zauv
Yuav ua li cas koj xam qhov hnyav thiab qhov sib npaug ntawm lub dav hlau?
Ntxiv tag nrho cov sijhawm mus nrhiav lub sijhawm tag nrho. Faib tag nrho lub sijhawm los ntawm qhov hnyav tag nrho kom pom qhov nruab nrab ntawm lub ntiajteb txawj nqus. Nrhiav tag nrho qhov hnyav thiab qhov nruab nrab ntawm lub ntiajteb txawj nqus ntawm qhov nruab nrab ntawm lub ntiajteb txawj nqus daim ntawv qhia hauv koj lub dav hlau POH los txiav txim seb lub dav hlau puas nyob hauv qhov txwv
Nws puas yuav ua rau pom qhov sib npaug ntawm kab sib npaug mus rau ib kab thiab los ntawm ib qho taw tes ntawm kab?
Qhov sib npaug ntawm ib kab uas yog parallel lossis perpendicular rau ib kab? Cov lus teb tau: Cov nqes hav ntawm cov kab sib npaug sib npaug. Hloov txoj kab nqes paub thiab cov kev sib koom ua ke ntawm ib qho taw tes ntawm lwm txoj kab rau hauv daim ntawv point-slope kom pom qhov sib npaug ntawm kab sib npaug
Yuav ua li cas koj pom qhov ntev ntawm ib daim duab plaub thaum muab lub perimeter?
Nrhiav Length thiab Dav Thaum Koj Paub Cheeb Tsam thiab Perimeter Yog tias koj tshwm sim kom paub qhov kev ncua deb nyob ib ncig ntawm lub kaum sab xis, uas yog nws qhov perimeter, koj tuaj yeem daws qhov sib npaug ntawm L thiab W. Thawj qhov sib npaug yog rau thaj tsam, A = L ⋅ W, thiab qhov thib ob yog qhov perimeter, P = 2L + 2W
Lub laj kab laj kab yog li cas?
Qhwv thiab staple lub laj kab nyob ib ncig ntawm cov ceg txheem ntseeg. Unroll lub laj kab laj kab thiab qhwv nws hla cov ceg txheem ntseeg kom cov hauv qab ntawm cov ntaub so hauv lub trench. Thaum koj qhwv lub laj kab rau ntawm ib sab ntawm cov ceg txheem ntseeg, siv lub staple lossis rauj phom los txuas cov ntaub rau cov ceg txheem ntseeg