Yuav ua li cas mus nrhiav tau cov kev taw qhia ntawm daim duab peb sab. Peb pib nrog ib tug yooj yim

Daim duab peb sab - ib tug geometrical daim duab, uas muaj peb cov ntsiab lus, nyob rau hauv lem, lawv hu ua vertices, wherein lawv muaj kev cob cog nyob rau hauv series ntawm cov feem. Cov feem no yog hu ua cov sab ntawm daim duab peb sab. Muaj ntau ntau hom ntawm cov vajvoos peb sab, namely:

1. Lub magnitude ntawm cov ces kaum:

- obtuse (thaum ib tug ntawm cov ces kaum yog saum toj no cuaj caum-degree ntsuas degrees);

- lub (thaum ib tug ntawm cov ces kaum yog cuaj caum degrees);

- mob-angled (nyob qhov twg tag nrho cov ces kaum muaj gradusnuju ntsuas tsawg tshaj li cuaj caum degrees).

2. Los ntawm tus xov tooj muaj sib npaug zos sab:

- ntau yam (tag nrho cov sab txawv nyob rau hauv loj);

- ceskaum (ob sab sib npaug);

- equilateral (tag nrho cov sab muaj sib npaug zos ntev).

Muaj nqis ntsoov teev yog qhov tseeb hais tias lub sum degree angle ntsuas nyob rau hauv ib tug daim duab peb sab yog yeej ib txwm 180 degrees, tsis hais txog ntawm lub hom ntawm cov zoo lawm xwb. Yog li ntawd, nyob rau hauv lub ces kaum ntawm ib daim duab peb sab equilateral, uas pw rau tom lub hauv paus, yeej ib txwm sib npaug zos. Thiab nyob rau hauv ib tug equilateral daim duab peb sab , txhua lub kaum sab xis muaj raws nraim caum degrees. Lub angled daim duab peb sab nrhiav lub txaus rau noj tam sim ntawd los ntawm cuaj caum degrees paub lub. Ces lawv yuav paub tag nrho cov kauj ruam degree.

Paub txog degree ntsuas ntawm lub ces kaum yeej ib txwm muab ib lo lus teb rau lo lus nug ntawm yuav ua li cas nrhiav tau cov sab ntawm ib tug daim duab peb sab. Xav txog tag nrho cov piv txwv ntawm ib txoj cai daim duab peb sab, raws li nws yog ntau ntau yam. Nyob rau hauv tas li ntawd, equilateral thiab ceskaum cov vajvoos peb sab yuav muab tau yooj yim sawv cev nyob rau hauv daim ntawv ntawm ob rectangular, tab sis xav paub ntxiv txog hais tias tom qab.

Qhov tseem degree ntsuas yog tsis txaus. Nws tsuas xav tau nyob rau hauv thiaj li yuav tau los mus laij lub trigonometric ratios, namely:

Kev txhaum - tus piv ntawm cov uas nyob ib sab ceg mus rau lub hypotenuse, cos - lub ratio ntawm tus txheem ceg mus rau lub hypotenuse, TG - tus piv ntawm cov uas nyob ib sab ceg mus rau lub opposite, Ctg - tus piv ntawm cov lus rov txhais ceg mus rau lub nyob ib sab.

Yog li ntawd, yuav ua li cas nrhiav tau cov sab ntawm ib txoj cai daim duab peb sab? Paub qhov kev sib raug zoo, koj muaj peev xwm siv lub theorem ntawm sines, uas nyeem hais tias raws li nram no: ib sab belongs rau lub sine ntawm lub kaum sab xis raws li zoo raws li lub lwm tus neeg siv mus rau lub sine ntawm lub kaum sab xis ntawm lub lwm yam, thiab ib tug thib peb tog muaj tib lub nam piv thiab cov sine ntawm lub kaum sab xis, raws li zoo raws li lub yav dhau los ob tug.

Raws li yuav pom los ntawm cov theorem ntawm sines txuj ci yuav tsis txaus. Nws yog tsim nyog los paub qhov kev ntsuas qhov ntev muaj tsawg kawg yog ib sab. Ces yuav ua li cas nrhiav tau cov sab ntawm ib tug daim duab peb sab, nws tsis ua heev npaum li teeb meem. Los yog muaj yog lwm cov kev xaiv. Los yog los ntawm lub cosine ntawm qhov opposite mus nrhiav ib tug ntawm ob txhais ceg ntawm lub duab peb sab, lub hypotenuse yuav tsum tau khoo los ntawm cov sine los yog cov uas nyob ib sab ces kaum. RESPONSIBILITIES sab tsis hloov.

Nyob rau hauv tas li ntawd, nws yog tej zaum yuav siv tag nrho cov paub Pythagorean theorem, uas nyob rau hauv lem muab: square ntawm lub hypotenuse sib npaug rau hauv lub sum ntawm cov plaub fab ntawm lub ob sab. Ntawm no, peb paub qhov ob ntsuas ntawm lub sab, koj yuav tau yooj yim txiav txim seb tus nqi ntawm peb.

Muaj yog ib tug theorem yuav ua li cas mus nrhiav tau lub sab ntawm ib tug daim duab peb sab. Cosine theorem: ib qho kev ntsuas ntawm lub sab ntev yog sib npaug zos rau cov square hauv paus ntawm lub sum ntawm cov plaub fab ntawm lub ob sab tsis muaj tus coj cov khoom ntawm cov sab, uas yog nyob rau hauv lem khoo los ntawm lub cosine ntawm lub kaum sab xis ntawm lawv.

Thiab yuav ua li cas nrhiav tau cov kev taw qhia ntawm ib tug ceskaum daim duab peb sab? Qhov twg koj muaj cai nyob ua ib ke tag nrho cov ntsiab cai thiab cov theorem uas rau lub rectangular, tab sis muaj ib co nuances.

Ua ntej koj yuav mus txo lub qhov siab ntawm daim duab peb sab puag. Yog li, peb tau txais ob tug zoo tib lub daim duab peb sab, thiab uas yuav thov yav tas los kawm tuition. Yuav ua li cas mus nrhiav tau cov kev taw qhia ntawm daim duab peb sab? Peb yuav tau txais thiab lub hypotenuse, thiab ob txhais ceg. Yog hais tias peb nrhiav tau cov hypotenuse, ces peb twb paub ob sab ntawm ib tug daim duab peb sab. Yog hais tias, txawm li cas los, peb nyob rau hauv cov ceg, uas yog tsis siab, ces thaum txawj nws los ntawm ob tug, peb tau tus nqi ntawm ib tug thib peb tog.

Feem ntau muaj cov teeb meem thaum tsis muaj leej twg tog yeej yog tog tsis muab. Nyob rau hauv cov ntaub ntawv no nws yog tsim nyog los ua kom paub ib co tsis paub X, thiab kom nrhiav tag nrho cov nyob ib ncig ntawm, tsis hmoog rau cov kev hloov ntawm no zoo.