Thaj tsam vs Perimeter
Tej cheeb tsam yog ib lub tswv yim ua lej uas peb feem coob paub txog vim nws tau siv hauv lub neej txhua hnub xws li thaum sim nrhiav qhov chaw zoo hauv chav lossis tsev. Qhov no yog ib lub tswv yim uas muaj txiaj ntsig zoo rau peb txhua tus, thiab txawm tias peb muaj lej los yog tsis yog peb qhov kev kawm hauv peb qhov kev kawm tiav, peb txhua tus paub yuav ua li cas xam thaj tsam ntawm thaj chaw, lub voj voog, lossis ib lub voj voog. Txawm li cas los xij, muaj lwm lub tswv yim hais txog kev ua lej hu ua perimeter ntawm daim duab uas tseem ceeb heev hauv qee qhov xwm txheej. Cov neeg uas nyob hauv cov chav kawm junior tau yooj yim qhia qhov txawv ntawm cheeb tsam thiab ib puag ncig tab sis rau lwm tus, nws yuav nyuaj heev. Kab lus no yuav siv sij hawm los saib xyuas cov ntsiab lus tseem ceeb ntawm lej no kom cov neeg nyeem siv tau yog tias xav tau.
Thaj chaw yog ib lub tswv yim uas los rau hauv kev ua si thaum koj tab tom hloov chav tsev lossis thaum koj tab tom mus pleev xim chav. Cia peb pom tias lub tswv yim no muaj txiaj ntsig npaum li cas hauv cov xwm txheej no. Piv txwv tias koj xav tau cov vuas ntsia hauv koj chav nyob, thiab qhov ntev thiab dav ntawm hauv pem teb yog 20 feet thiab 15 feet raws li. Txhawm rau xam qhov chaw uas koj yuav tsum tau nruab cov vuas, koj yuav tsum nrhiav cov khoom ntawm ob daim duab no. Nyob rau hauv cov ntaub ntawv no nws yog xam raws li nram no.
luas=20 x 15=300 m²
Yog li, yog cov vuas koj tau ua tiav yog 2 × 2 feet
Koj yeej xav tau 300/4=75 vuas los npog hauv pem teb ntawm koj chav.
Tam sim no, cia peb saib seb qhov kev suav ib puag ncig ua qhov tseem ceeb thaum koj tab tom sim ua laj kab nyob ib puag ncig koj daim teb uas yog duab plaub. Yog hais tias lub teb yog 20 × 15 ko taw loj (xav txog), lub perimeter yog 2x (20 + 15)=70 ko taw. Yog li, koj xav tau 70 ko taw ntawm cov khoom siv laj kab kom ua tiav txoj haujlwm.
Qhov txawv ntawm Cheeb Tsam thiab Perimeter yog dab tsi?
• Cheeb Tsam yog tag nrho qhov chaw hauv daim duab geometrical uas yog qhov tseem ceeb rau khaws cov khoom hauv chav lossis thaum koj sim ntsuas tus nqi ntawm cov khoom ib square feet
• Perimeter yog zoo li ib ncig ntawm daim duab (xws li lub voj voog) uas pab kom nkag siab qhov kev ncua deb uas npog los ntawm daim duab geometrical zoo li daim teb.
