Yog li, thaj tsam A ntawm daim duab peb sab yog muab los ntawm formula A=12bh qhov twg b yog lub hauv paus thiab h yog qhov siab ntawm daim duab peb sab Piv txwv: Nrhiav thaj chaw ntawm daim duab peb sab. Thaj tsam A ntawm daim duab peb sab yog muab los ntawm cov qauv A=12bh qhov twg b yog lub hauv paus thiab h yog qhov siab ntawm daim duab peb sab.
Yuav ua li cas koj pom thaj tsam ntawm daim duab peb sab nrog 3 sab?
Thaj tsam ntawm daim duab peb sab yog dab tsi nrog 3 Sab Sib npaug? Yog tias daim duab peb sab muaj 3 sab sib npaug, nws hu ua daim duab peb sab sib npaug. Qhov cheeb tsam ntawm daim duab peb sab sib npaug tuaj yeem suav nrog cov qauv, Area=a 2(√3/4), qhov 'a' yog sab ntawm daim duab peb sab.
cheeb tsam daim duab peb sab yog dab tsi?
Thaj chaw ntawm daim duab peb sab txhais tau tias tag nrho qhov chaw nyob los ntawm peb sab ntawm daim duab peb sab hauv 2 lub dav hlau. Cov mis mos yooj yim rau thaj tsam ntawm daim duab peb sab yog sib npaug rau ib nrab ntawm cov khoom ntawm nws lub hauv paus thiab qhov siab, piv txwv li, A=1/2 × b × h.
Kuv nrhiav thaj chaw li cas?
Yuav kom pom thaj 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 qhov tib ntev) thiab muab qhov no los ntawm nws tus kheej kom pom thaj chaw. Qhov no yog tib yam hais tias length2 los yog ntev squared.
Tus qauv ntawm cheeb tsam yog dab tsi?
Cov qauv cheeb tsam yooj yim tshaj plaws yog cov qauv rau thaj tsam ntawm ib lub duab plaub. Muab ib daim duab plaub nrog qhov ntev l thiab qhov dav w, tus qauv rau thaj tsam yog: A=lw (lub voos xwmfab) … Raws li qhov tshwj xeeb, li l=w hauv rooj plaub ntawm lub square thaj tsam ntawm ib lub square nrog sab ntev s yog muab los ntawm cov mis: A=s2 (square).
