Cov chaw muag khoom yog qhov taw qhia tseem ceeb ntawm cov hauv paus ntawm cov kev suav uas tau ua. Tau nyiaj, tus nqi, txiaj ntsig, thiab ntau yam kev taw qhia txog nyiaj txiag tau suav nrog siv tus nqi no.
Cov Lus Qhia
Kauj ruam 1
Ua ntej, xam tawm dab tsi yog nyob rau hauv cov tswvyim no. Raws li Txoj Cai Lij Choj, qhov chaw muag khoom xa mus yog ib feem ntawm lub khw uas siv rau kev tso saib thiab ua kom pom cov khoom lag luam, khoom siv rau kev siv, ua kev them nyiaj thiab lwm yam kev ua haujlwm ntsig txog cov neeg siv khoom.
Kauj ruam 2
Ua ib txoj kev npaj ntawm lub xaib thiab kos rau ntawm nws cov chaw uas poob rau hauv lub sijhawm. Lawv yuav tsum ntsuas. Yog tias muaj ob peb yam xws li, tom qab nrhiav pom qhov ntsuas ntawm qhov muag muag ntawm txhua ntawm lawv, cov nqi yuav xav tau ntxiv.
Kauj ruam 3
Yog hais tias chav tsev muaj lub xwm fab xwm meem lossis duab plaub nrog cov npoo sib luag thiab 90 ° kaum, ces thaj chaw tau muab suav los ntawm sib npaug thiab qhov ntev ntawm cov kab rov tav. Txawm li cas los xij, hauv kev coj ua, cov xwm txheej zoo li no muaj tsawg.
Kauj ruam 4
Koj tuaj yeem nrhiav thaj tsam ntawm daim duab tsis xwm yeem uas yog siv cov txheej txheem hauv qab no. Xaiv cov duab plaub fab, ua ntej suav nws cov nqi hauv cheeb tsam, thiab tom qab ntawd pom qhov ntsuas no muaj feem cuam tshuam nrog cov seem. Raws li txoj cai, ntu ob yuav muaj cov duab ntawm cov duab peb ceg, rhombus lossis parallelogram, yog li siv ib daim qauv: - daim duab peb sab - S = √p (pa) (pb) (pc), qhov twg a, b thiab c qhov ntev ntawm ob sab ntawm daim duab peb sab, p - ib nrab puag ncig; - rhombus - S = * a * b, qhov twg a thiab b yog qhov ntev ntawm cov kab ntawm cov rhombus; - parallelogram - S = b * h, qhov twg b yog qhov ntev ntawm ib qho ntawm ob sab ntawm daim duab, thiab h yog qhov siab tau kos rau sab.
Kauj ruam 5
Rho tawm los ntawm tus nqi ntawm qhov pom pom ntawm thaj chaw ntawm kev nqa lub thawv, kab, davhlau ntawm theem ntaiv, cov ris tsho uas tsis yog qhov ntsuas ntawm thaj chaw muag khoom.
