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Video: Dab tsi yog qhov sib thooj ntawm daim duab peb sab sib dhos?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Qhov sib thooj ntawm cov duab peb sab sib dhos yog Kev sib haum xeeb
Nws txhais tau hais tias yog ob trangles paub tias yog kev sib haum xeeb , ces tag nrho sib raug kaum / sab kuj yog kev sib haum xeeb . Piv txwv li, yog tias 2 daim duab peb sab yog kev sib haum xeeb los ntawm SSS, ces peb kuj paub tias cov ces kaum ntawm 2 daim duab peb sab yog kev sib haum xeeb.
Xav txog qhov no, dab tsi yog qhov sib thooj ntawm daim duab peb sab?
Sib raug sab . Sib raug sab kov tib ob lub kaum ntse ntse. Thaum lub sab yog sib raug txhais tau tias mus ntawm ib qho daim duab peb sab rau lwm tus koj tuaj yeem sib ntxiv txhua sab los ntawm tib tus lej. Hauv daim duab zoo sib xws daim duab peb sab tus sib raug sab yog tib xim.
Tsis tas li ntawd, cov lus hais txog qhov sib thooj ntawm daim duab peb sab yog congruent raws li? Kev sib haum xeeb ntawm daim duab peb sab . Ob triangles yog congruent yog lawv sib raug sab yog sib npaug ntawm qhov ntev, thiab lawv sib raug cov ces kaum sib npaug hauv kev ntsuas.
Ua li no, SSS SAS ASA AAS yog dab tsi?
Qhov "suav nrog lub kaum sab xis" hauv SAS yog lub kaum sab xis tsim los ntawm ob sab ntawm daim duab peb sab siv. Qhov "nrog rau sab" hauv ASA yog ib sab ntawm cov ces kaum siv. Thaum daim duab peb sab yog pov thawj congruent, cov seem "qhov" uas tsis tau siv nyob rau hauv SSS , SAS , ASA , AAS thiab HL, kuj sib haum.
Cov duab peb sab twg yuav tsum sib haum?
Triangles yog congruent yog tias:
- SSS (sab sab sab) Tag nrho peb sab sib txuas yog sib npaug ntawm qhov ntev.
- SAS (sab kaum sab xis) Ib khub ntawm sab sib raug thiab lub kaum sab xis suav sib npaug.
- ASA (lub kaum sab xis)
- AAS (lub kaum sab xis sab)
- HL (hypotenuse ceg ntawm txoj cai daim duab peb sab)
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
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 qhov sib thooj ntawm daim duab peb sab congruent?
CPCTC yog cov lus luv rau cov khoom sib thooj ntawm cov duab peb sab sib dhos yog congruent. CPCTC feem ntau yog siv los yog ze rau qhov kawg ntawm cov pov thawj uas hais kom tus menyuam kawm ntawv qhia tias ob lub kaum sab xis lossis ob sab yog qhov sib haum. Qhov sib thooj txhais tau tias lawv nyob hauv tib txoj hauj lwm hauv 2 daim duab peb sab
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