Video: Dab tsi yog daim duab peb sab piv txwv?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Lub ntsiab txhais ntawm a daim duab peb sab yog ib daim duab peb sab thiab peb sab. Ib piv txwv ntawm ib yam dab tsi nyob rau hauv cov duab ntawm a daim duab peb sab yog ib daim pizza.
Ib yam li ntawd, qhov piv txwv ntawm lub neej tiag tiag ntawm daim duab peb sab yog dab tsi?
Tsheb ciav hlau. Cov paib tsheb uas feem ntau pom piv txwv ntawm daim duab peb sab hauv peb lub neej txhua hnub lub neej . Cov paib yog sib npaug daim duab peb sab puab; uas txhais tau hais tias tag nrho peb sab yog qhov sib npaug ntawm qhov ntev thiab muaj qhov sib npaug.
Dab tsi yog daim duab peb sab? Muaj ntau lub npe sib txawv rau cov hom duab peb sab. Ib daim duab peb sab hom nyob ntawm qhov ntev ntawm nws sab thiab qhov loj ntawm nws lub kaum sab xis (pob). Muaj peb hom daim duab peb sab raws li qhov ntev ntawm lub sab : sib npaug , isosceles , thiab scalene . Cov kab ntsuab cim cov sab ntawm sib npaug (tib yam) ntev.
Kuj kom paub, Dab tsi yog Daim duab peb sab piav qhia?
A daim duab peb sab yog ib daim duab, los yog ib feem ntawm ob qhov chaw seem. Nws muaj peb sab ncaj thiab peb vertices. Peb lub kaum sab xis ntawm a daim duab peb sab ib txwm ntxiv txog 180 ° (180 degrees). Nws yog lub polygon uas muaj tsawg kawg nkaus ntawm sab.
Daim duab peb sab siv rau dab tsi?
A daim duab peb sab yog ib lub cuab yeej siv los kos cov kab sib luag, kab ntsug, thiab lwm cov kab sib dhos. Feem ntau, ob lub kaum sab xis daim duab peb sab daim ntawm cov kaum sib txawv ua ib txheej.
Pom zoo:
Dab tsi yog equidistant los ntawm peb sab ntawm daim duab peb sab?
Lub ntsiab lus uas sib npaug rau txhua sab ntawm daim duab peb sab yog hu ua incenter: Ib qho nruab nrab yog ib qho kab uas muaj ib qho ntawm nws qhov kawg ntawm lub vertex ntawm daim duab peb sab thiab lwm qhov kawg ntawm qhov nruab nrab ntawm sab opposite lub vertex. Peb qhov nruab nrab ntawm ib daim duab peb sab sib ntsib hauv centroid
Dab tsi yog lub kaum sab xis ntsuas hauv daim duab peb sab ABC?
Kev piav qhia ib kauj ruam dhau los: Nws tau muab tias ABC yog lub kaum sab xis uas yog kaum sab xis ntawm C thiab AC = 7 ntiv tes thiab CB = 5 ntiv tes. Yog li, qhov ntsuas ntawm cov kaum sab xis uas ploj lawm hauv daim duab peb sab ABC yog 35.5 ° thiab 54.5 ° feem
Koj tuaj yeem ua pov thawj li cas 2 daim duab peb sab zoo sib xws siv lub kaum sab xis sab SAS zoo sib xws postulate?
SAS Similarity Theorem hais tias yog ob sab hauv ib daim duab peb sab yog proportional rau ob sab hauv lwm daim duab peb sab thiab lub kaum sab xis nyob rau hauv ob qho tib si congruent, ces ob daim duab peb sab zoo ib yam. Ib qho kev hloov pauv zoo sib xws yog ib lossis ntau qhov kev hloov pauv tsis tu ncua ua raws li kev dilation
Vim li cas nws thiaj li hais tias lub Orthocenter ntawm daim duab peb sab obtuse yuav tsum nyob rau sab nraud ntawm daim duab peb sab?
Nws hloov tawm tias tag nrho peb qhov siab ib txwm sib tshuam ntawm tib lub ntsiab lus - lub npe hu ua orthocenter ntawm daim duab peb sab. Lub orthocenter tsis yog ib txwm nyob hauv daim duab peb sab. Yog tias daim duab peb sab yog obtuse, nws yuav nyob sab nraud. Txhawm rau ua kom qhov no tshwm sim cov kab qhov siab yuav tsum tau txuas ntxiv kom lawv hla
Dab tsi yog kev sib raug zoo ntawm sab nrauv thiab sab hauv lub kaum sab xis ntawm daim duab peb sab?
Cov kaum sab hauv yog hu ua Sab hauv cov ces kaum. Cov lej ntawm cov kaum sab hauv ntawm daim duab peb sab yog ib txwm 180 degrees. Lub kaum sab nrauv yog lub kaum sab xis ntawm ib sab ntawm ib qho duab, thiab ib txoj kab txuas ntxiv los ntawm sab tom ntej. Qhov sib npaug ntawm lub kaum sab nrauv thiab nws lub kaum sab hauv uas nyob ib sab kuj yog 180 degrees