Video: Ua li cas koj nrhiav thaj tsam nrog kev txhaum?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Nrhiav qhov Thaj chaw ntawm daim duab peb sab siv Sine . Koj paub txog cov qauv R = 12bh kom pom cov cheeb tsam ntawm daim duab peb sab qhov twg b yog qhov ntev ntawm lub hauv paus ntawm daim duab peb sab thiab h yog qhov siab, los yog qhov ntev ntawm lub perpendicular mus rau lub hauv paus los ntawm opposite vertex. Piv txwv tias ΔABC muaj sab ntev a, b, thiab c.
Ntawm no, ua li cas koj pom thaj tsam ntawm daim duab peb sab siv sine?
Cov txoj cai cheeb tsam hais tias cov cheeb tsam ntawm tej daim duab peb sab yog sib npaug rau ib nrab ntawm cov khoom ntawm qhov ntev ntawm ob sab ntawm lub daim duab peb sab multiplied los ntawm sib ntawm lub kaum sab xis suav nrog ob sab.
Tsis tas li ntawd, tus qauv rau ib daim duab peb sab yog dab tsi? Thaj tsam ntawm a daim duab peb sab yog txhais raws li tag nrho qhov chaw uas yog enclosed ib yam tshwj xeeb daim duab peb sab . Qhov yooj yim qauv mus nrhiav thaj tsam ntawm ib tug muab daim duab peb sab yog A = 1/2 × b × h, qhov twg b yog lub hauv paus thiab h yog qhov siab ntawm qhov muab daim duab peb sab , seb nws yog scalene, isosceles los yog equilateral.
Ntxiv rau qhov no, txoj cai rau thaj tsam ntawm daim duab peb sab yog dab tsi?
Yuav nrhiav tau thaj tsam ntawm ib daim duab peb sab , muab lub hauv paus los ntawm qhov siab, thiab muab faib los ntawm 2. Kev faib los ntawm 2 los ntawm qhov tseeb tias ib qho parallelogram tuaj yeem muab faib ua 2 daim duab peb sab . Piv txwv li, nyob rau hauv daim duab mus rau sab laug, lub cheeb tsam ntawm txhua tus daim duab peb sab yog sib npaug rau ib nrab ntawm cheeb tsam ntawm parallelogram.
Cov cheeb tsam ntawm daim duab peb sab puas tuaj yeem tsis zoo?
Cov mis no tso cai rau koj los xam cov thaj tsam ntawm ib daim duab peb sab thaum koj paub lub coordinates ntawm tag nrho peb vertices. Qhov no txhais tau hais tias nws yeej ib txwm zoo txawm tias cov qauv tsim ib tsis zoo tshwm sim. Polygons ua tau yeej tsis muaj ib thaj chaw tsis zoo.
Pom zoo:
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Lub kaum sab xis nruab nrab uas yog subtended los ntawm ib qho loj arc muaj qhov ntsuas loj dua 180 °. Cov mis arc ntev yog siv los nrhiav qhov ntev ntawm qhov arc ntawm lub voj voog; l=rθ l = r θ, qhov twg θ yog nyob rau hauv radians. Sector cheeb tsam pom A = 12θr2 A = 1 2 θ r 2, qhov twg θ yog nyob rau hauv radians
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