Video: S hauv daim duab peb sab yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Thaj tsam ntawm a Daim duab peb sab . Lwm qhov yog Heron's formulawhich muab thaj chaw nyob rau hauv cov nqe lus ntawm peb sab ntawm lub daim duab peb sab , tshwj xeeb, raws li lub hauv paus square ntawm cov khoom s ( s -a)( s -b)( s -c) qhov twg s yog lub semiperimeter ntawm lub daim duab peb sab , yog, s = (a + b + c)/2.
Ib yam li ntawd, S sawv cev rau dab tsi hauv Heron tus qauv?
QHIA-“ S ” yog cov ib nrab ntawm lub triangle perimeter. S =a+b+c/2. Taw qhia. Hero ntawm Alexandria. Cov qauv yog credit rau hero (los yog nyuj ) ntawm Alexandria.
Kuj Paub, Dab tsi yog lub ntsiab lus ntawm Daim duab peb sab hauv lej? A daim duab peb sab yog ib tug polygon nrog peb ntug thiab peb vertices. Nws yog ib qho ntawm cov duab yooj yim hauv geometry . A daim duab peb sab nrog vertices A, B, thiab C yog denoted. Hauv Euclidean geometry ib qho peb lub ntsiab lus, thaum tsis-collinear, txiav txim siab aunique daim duab peb sab thiab ib txhij, ib lub dav hlau tshwj xeeb (piv txwv li atwo-dimensional Euclidean space).
Ua kom pom qhov no, daim duab peb sab ib txwm hu ua dab tsi?
Ib qho kev sib npaug daim duab peb sab yog a daim duab peb sab nrog rau tag nrho peb sab ntawm qhov sib npaug ntawm qhov ntev, sib xws rau qhov yuav ua tau lub npe hu ua ib " tsis tu ncua " daim duab peb sab . Anequilateral daim duab peb sab yog li ntawd ib qho tshwj xeeb ntawm nisosceles daim duab peb sab tsis yog tsuas yog ob, tab sis tag nrho peb sab sib npaug.
Tus qauv ntawm feem pua yog dab tsi?
lej los txiav txim a feem pua yog faib tus lej (tus lej nyob rau sab saum toj ntawm feem) los ntawm tus lej (tus lej nyob hauv qab ntawm feem), ces muab cov lus teb los ntawm 100. Piv txwv li, cov feem 6/12 hloov mus rau tus lej zoo li no: 6 muab faib los ntawm 12. (uas sib npaug.5) x 100 sib npaug 50 feem pua.
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