S hauv daim duab peb sab yog dab tsi?
S hauv daim duab peb sab yog dab tsi?

Video: S hauv daim duab peb sab yog dab tsi?

Video: S hauv daim duab peb sab yog dab tsi?
Video: Leng Yang - Yog Vim Dab Tsi (Official Full Song | Nkauj Tawm Tshiab) 2020/05/24 2024, Kaum ib hlis
Anonim

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.

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