Nyob hauv ib daim duab peb sab sib npaug, qhov nruab nrab, lub kaum sab xis thiab qhov siab ntawm txhua sab yog tib yam thiab yog cov kab ntawm symmetry ntawm daim duab peb sab sib npaug. Thaj tsam ntawm daim duab peb sab sib npaug yog √3 a2/ 4. Qhov ib puag ncig ntawm daim duab peb sab sib npaug yog 3a.
Koj pom thaj tsam ntawm daim duab peb sab sib npaug li cas?
Yuav xam thaj tsam ntawm daim duab peb sab, muab lub hauv paus (ib sab ntawm daim duab peb sab sib npaug) thiab qhov siab (perpendicular bisector) thiab faib los ntawm ob.
Dab tsi yog tus qauv ntawm daim duab peb sab sib npaug?
Hauv ib daim duab peb sab sib npaug, txhua sab sib npaug thiab tag nrho cov kaum sab hauv yog 60 °. Yog li, thaj tsam ntawm daim duab peb sab sib npaug tuaj yeem suav tau yog tias qhov ntev ntawm ib sab paub. Tus qauv los xam cov cheeb tsam ntawm ib daim duab peb sab sib npaug yog muab raws li, Cheeb Tsam ntawm ib qho daim duab peb sab sib npaug=(√3/4) × a2 square units
Yuav ua li cas koj pom thaj tsam ntawm daim duab peb sab 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.
Peb pom thaj tsam ntawm daim duab peb sab li cas?
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.
