Rau tej xam yuav tsum tau ib tug ceskaum daim duab peb sab qhov siab

Daim duab peb sab - ib qho ntawm lub ntsiab nuj nqis nyob rau hauv geometry. Lees muab direct cov vajvoos peb sab (leej twg uas lub yog sib npaug zos rau 90 ⁰⁾ thiab ostro- obtuse (lub kaum sab xis tus nqi tsawg tshaj li 90 los yog ^0, ntsig txog), ceskaum thiab equilateral. Nyob rau hauv cov lus teb siv ntau hom yooj yim geometric tswv yim thiab qhov tseem ceeb (sine, nruab nrab lub vojvoog, perpendicular, etc.)

Lub ntsiab rau peb cov kev tshawb fawb yuav tsum muaj qhov siab qhov ntawm lub ceskaum daim duab peb sab. Delve rau hauv lub terminology thiab txhais cov ntsiab, peb yuav tsis tau tsuas yog luv luv txhais lub tswv yim hais tias yuav tsum tau to taub cov essence.

Yog li ntawd, ib tug ceskaum daim duab peb sab yog xav tau ib tug daim duab peb sab nyob rau hauv uas tus nqi ntawm cov ob sab qhia tib yam pes tsawg tus ntawm ib tug (koob pheej ntawm lawv no ntawm caj npab). Ceskaum daim duab peb sab yuav ua tau mob-angled thiab obtuse, thiab ncaj. Nws kuj yuav equilateral (tag nrho cov sab ntawm daim duab yog muaj sib npaug nyob rau hauv tus nqi). Feem ntau koj yuav hnov: tag nrho cov equilateral cov vajvoos peb sab ceskaum, ceskaum tab sis tsis yog txhua txhua - equilateral.

Qhov siab ntawm tej daim duab peb sab yog suav hais tias yog perpendicular poob los ntawm lub ces kaum nyob rau sab nraud ntawm daim duab. Nws ua raws li ib tug xov xwm ya los ntawm tus duab ntawm lub kaum sab xis ntawm qhov chaw ntawm lub opposite sab.

Lub zoo kawg li qhov siab ntawm ib tug ceskaum daim duab peb sab?

• Yog hais tias lub qhov siab, poob rau ntawm ib sab, nws yog theem nrab thiab bisector, ces daim duab peb sab yog ceskaum xam tau tias yog, thiab vice versa: daim duab peb sab yog ceskaum yog qhov siab uas nws txo qis los ntawm ib tug ntawm ob tog yog ob qho tib si bisector thiab theem nrab. Qhov no qhov siab yog hu ua tus thawj.
• Qhov siab nws txo qis nyob rau sab (sib npaug zos) sab ntawm ib tug ceskaum daim duab peb sab, yog zoo tib yam thiab tsim ob zoo xws li cov nuj nqis.
• Yog hais tias koj paub lub qhov siab ntawm lub ceskaum daim duab peb sab (raws li, tseeb, lwm yam), thiab sab hauv cov qhov siab tau nws txo qis, nws tseem tau mus paub cov cheeb tsam ntawm lub polygon. S = 1/2 * _(c * h c)

Yuav ua li cas siv lub qhov siab ntawm ib tug ceskaum daim duab peb sab nyob rau hauv cov lus teb? Properties nws nyob rau nws puag, ua raws li nram no assertion tuas:

• Cov yooj yim qhov siab, ua ob theem nrab faib rau lub hauv paus mus rau hauv ob sib npaug zos feem. Qhov no tso cai rau peb paub tus nqi ntawm lub hauv paus cheeb tsam ntawm daim duab peb sab tsim los ntawm lub siab, thiab lwm yam
• Raws li cov perpendicular qhov siab ntawm lub ceskaum daim duab peb sab yuav muab suav hais tias ib tug neeg sab nrauv (cov ceg) ntawm tus tshiab txoj cai-angled daim duab peb sab. Paub cov nqi ntawm txhua tus ntawm ob tog, raws li nyob rau hauv lub Pythagorean theorem (lub zoo-paub piv ntawm ob txhais ceg thiab lub hypotenuse squared qhov tseem ceeb) los mus laij lub zauv tus nqi ntawm lub qhov siab.

Yuav ua li cas yog lub qhov siab ntawm daim duab peb sab? Nyob rau hauv kev, ib tug ceskaum daim duab peb sab, uas peb xav tau tus siab, tsis tu tsis tseg mus yuav li ntawd nyob rau hauv lawv cov essence. Yog li ntawd, tsis txhob poob lawv qhov tseeb rau nws tag nrho cov qauv siv nyob rau hauv cov nuj nqis, xws li. Nws yog ua tau los mus laij lub qhov siab ntawm ntev, ces kaum thiab kev paub txog qhov kev tes, qhov ntau ntawm ob tog, thiab cov sab cheeb tsam, raws li zoo li ob peb lwm yam tsis. Lub qhov siab ntawm daim duab peb sab yog sib npaug zos rau ib tug tej yam piv ntawm cov qhov tseem ceeb. Muab koj tus kheej cov mis tsis ua kev zoo siab mus nrhiav tau yooj yim. Nyob rau hauv tas li ntawd, muaj ib tug tsawg kawg nkaus ntawm cov ntaub ntawv, koj yuav nrhiav tau qhov tseem ceeb thiab xwb ces npaj mus rau xam qhov siab qhov.