cheeb tsam yog ntsuas ntawm qhov chaw ntawm cov duab. Txhawm rau nrhiav thaj tsam ntawm ib daim duab plaub lossis ib lub xwmfab koj yuav tsum muab qhov ntev thiab qhov dav ntawm daim duab plaub lossis ib lub square. Thaj chaw, A, yog x zaug y.
Puas yog cheeb tsam ntsuas lossis xam?
Lo lus 'chaw' txhais tau tias qhov chaw tsis muaj. Thaj tsam ntawm ib daim duab yog xam nrog kev pab ntawm nws qhov ntev thiab dav. Length yog unidimensional thiab ntsuas nyob rau hauv units xws li ko taw (ft), yards (yd), inches (in), thiab lwm yam. Txawm li cas los xij, thaj tsam ntawm ib qho duab yog ob-dimensional kom muaj nuj nqis.
Koj sau cheeb tsam li cas hauv lej?
Thaj tsam yog ntsuas hauv square units xws li square inches, square feet lossis square meters. Txhawm rau nrhiav thaj tsam ntawm ib daim duab plaub, muab qhov ntev los ntawm qhov dav. Cov mis yog: A=LWqhov twg A yog thaj chaw, L yog qhov ntev, W yog qhov dav, thiabtxhais tau tias sib npaug.
Zaj piv txwv yog dab tsi?
Thaj chaw yog ntsuas seb qhov chaw muaj pes tsawg ntawm qhov chaw tiaj tus. … Piv txwv li, nyob rau hauv ib lub duab plaub peb pom thaj tsam los ntawm kev muab qhov ntev ntawm qhov dav. Hauv daim duab plaub saum toj no, thaj tsam yog 2 × 4 lossis 8. Yog tias koj suav cov squares me me koj yuav pom muaj 8 ntawm lawv.
Tus qauv rau cheeb tsam yog dab tsi?
Muab ib daim duab plaub nrog qhov ntev l thiab qhov dav w, tus qauv rau cheeb tsam yog: A=lw (rectangle) Qhov ntawd yog, thaj tsam ntawm lub duab plaub yog qhov ntev multiplied ntawm qhov dav. Raws li qhov tshwj xeeb, raws li l=w nyob rau hauv rooj plaub ntawm ib lub xwmfab, thaj tsam ntawm ib lub square nrog sab ntev s yog muab los ntawm tus qauv: A=s2 (square).
