Thaj chaw yog qhov chaw nyob hauv ib puag ncig ntawm 2D duab. Nws yog ntsuas nyob rau hauv square units, xws li cm², m², thiab lwm yam. Yuav kom nrhiav tau lub cheeb tsam ntawm ib tug quadrilateral, koj yuav tsum muab qhov ntev ntawm qhov dav. Piv txwv li, ib daim duab plaub nrog ob sab ntawm 3cm thiab 4cm yuav muaj thaj tsam ntawm 12cm².
cheeb tsam formula yog dab tsi?
Given a rectangle with length l and width w, the formula for the area is: A=lw (rectangle) . Ntawd yog, thaj tsam ntawm daim duab plaub yog qhov ntev muab faib ua 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).
Puas yog thaj chaw sab hauv lossis sab nraud?
Perimeter yog qhov kev ncua deb nyob ib puag ncig sab nraud ntawm cov duab. Thaj tsam ntsuas qhov chaw hauv ib qho duab.
Dab tsi txawv ntawm ib puag ncig thiab thaj chaw?
Lub ib puag ncig ntawm shape sawv cev qhov kev ncua deb nyob ib puag ncig nws, thaj tsam ntawm cov duab yog qhov chaw lossis qhov chaw tiaj tus uas cov duab npog (hauv 2D) thaum lub ntim ntawm ib Cov duab yog qhov chaw nws nyob hauv lub neej tiag tiag (hauv 3D).
Yuav nrhiav thaj chaw twg yog qhov yooj yim tshaj plaws?
Qhov yooj yim tshaj plaws (thiab feem ntau siv) cov kev suav hauv cheeb tsam yog rau cov squares thiab duab plaub. Txhawm rau pom thaj tsam ntawm 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 ces muab qhov no los ntawm nws tus kheej kom pom covthaj chaw.
