Dab tsi yog cheeb tsam hauv lej rau cov menyuam yaus?
Dab tsi yog cheeb tsam hauv lej rau cov menyuam yaus?

Video: Dab tsi yog cheeb tsam hauv lej rau cov menyuam yaus?

Video: Dab tsi yog cheeb tsam hauv lej rau cov menyuam yaus?
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Tus nqi ntawm qhov chaw nyob rau hauv ciam teb ntawm ib tug ca (2-dimensional) khoom xws li ib daim duab peb sab los yog lub voj voog, los yog nto ntawm ib tug khoom (3-dimensional) khoom.

Ib yam li ntawd, lub ntsiab txhais ntawm cheeb tsam hauv lej yog dab tsi?

Thaj chaw yog qhov kom muaj nuj nqis uas qhia txog qhov ntau npaum li cas ntawm daim duab ob sab los yog cov duab los yog planar lamina, hauv lub dav hlau. Hauv lej , unit square yog txhais kom muaj cheeb tsam ib, og cheeb tsam ntawm lwm yam duab los yog nto yog ib tug dimensionless tus naj npawb tiag.

Ib yam li ntawd, peb yuav 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.

Yog li ntawd, koj yuav nrhiav tau thaj tsam li cas hauv qib 4 lej?

Rau nrhiav thaj chaw ntawm ib daim duab plaub, suav tus naj npawb ntawm cov square units lossis siv tus qauv. Muab qhov ntev (l) los ntawm qhov dav (w) rau nrhiav thaj chaw (A) ntawm ib daim duab plaub. Rau nrhiav thaj chaw ntawm daim duab complex, cais nws mus rau hauv cov duab yooj yim, nrhiav cov cheeb tsam, thiab tom qab ntawd ntxiv cov cheeb tsam ua ke.

Lub cheeb tsam yog dab tsi?

Hauv geometry, lub cheeb tsam tuaj yeem txhais tau tias yog qhov chaw nyob ntawm lub tiaj tus duab lossis qhov chaw ntawm ib qho khoom. Cov cheeb tsam ntawm ib daim duab yog tus naj npawb ntawm cov squares uas npog saum npoo ntawm daim duab kaw. Thaj chaw yog ntsuas hauv square units xws li square centimteres, square feet, square inches, thiab lwm yam.

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