Video: Koj ua pov thawj tias daim duab peb sab zoo li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Yog tias ob khub ntawm cov ces kaum sib npaug hauv ib khub ntawm daim duab peb sab yog congruent, ces cov daim duab peb sab zoo ib yam . Peb paub qhov no vim yog tias ob lub kaum sab xis yog tib yam, ces tus khub thib peb kuj yuav tsum sib npaug. Thaum peb lub kaum sab xis yog txhua qhov sib npaug, peb khub ntawm sab yuav tsum tau sib npaug.
Hais txog qhov no, koj ua pov thawj cov duab zoo sib xws li cas?
Ob daim duab uas muaj tib yam puab hais tias yog zoo sib xws . Thaum ob daim duab yog zoo sib xws , qhov sib piv ntawm qhov ntev ntawm lawv qhov sib thooj yog sib npaug. Txhawm rau txiav txim siab yog tias daim duab peb sab hauv qab no zoo sib xws , sib piv lawv cov sib raug zoo sab.
Ib tug kuj yuav nug, SAS Similarity Theorem yog dab tsi? SAS Similarity Theorem : Yog tias lub kaum sab xis ntawm ib daim duab peb sab sib haum rau lub kaum sab xis ntawm lwm daim duab peb sab thiab qhov ntev ntawm ob sab nrog rau cov ces kaum yog nyob rau hauv kev faib ua feem, ces cov duab peb sab zoo ib yam.
Hauv qhov no, koj ua pov thawj li cas AA zoo sib xws?
AA zoo sib xws : Yog tias ob lub kaum sab xis ntawm ib daim duab peb sab sib npaug rau ob lub kaum sab xis ntawm lwm daim duab peb sab, ces ob daim duab peb sab zoo ib yam. Cov ntaub ntawv pov thawj: Cia ΔABC thiab ΔDEF yog ob daim duab peb sab xws li ∠A = ∠D thiab ∠B = ∠E. Yog li ob daim duab peb sab yog sib npaug thiab yog li lawv zoo sib xws los ntawm AA.
Dab tsi yog 3 daim duab peb sab zoo sib xws theorems?
Cov duab peb sab zoo sib xws yog ib qho yooj yim los txheeb xyuas vim tias koj tuaj yeem siv peb lub theorems tshwj xeeb rau daim duab peb sab. Peb lub theorems no, hu ua Lub kaum sab xis - Lub kaum sab xis (UA), Sab - Lub kaum sab xis - Sab (SAS), thiab Sab - Sab - Sab ( SSS ), yog txoj hauv kev tsis zoo rau kev txiav txim siab zoo sib xws hauv daim duab peb sab.
Pom zoo:
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
Koj ua pov thawj li cas ntawm cov ces kaum sab nrauv ntawm daim duab peb sab yog 360?
Lub kaum sab nrauv ntawm daim duab peb sab yog sib npaug rau qhov sib npaug ntawm cov kaum sab hauv sab nraud. Yog xav paub ntxiv txog qhov no saib Daim duab peb sab sab nraud lub kaum sab xis theorem. Yog tias lub kaum sib npaug raug coj los ntawm txhua qhov vertex, cov ces kaum sab nrauv ib txwm ntxiv rau 360 ° Qhov tseeb, qhov no muaj tseeb rau txhua qhov convex polygon, tsis yog daim duab peb sab
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
Yuav ua li cas koj pom ob sab ntawm daim duab peb sab prism?
Qhov sib npaug ntawm ob qhov yooj yim tshaj plaws yog: ntim = 0.5 * b * h * ntev, qhov twg b yog qhov ntev ntawm lub hauv paus ntawm daim duab peb sab, h yog qhov siab ntawm daim duab peb sab thiab ntev yog prism ntev. cheeb tsam = ntev * (a + b + c) + (2 * base_area), qhov twg a, b, saib xyuas sab ntawm daim duab peb sab thiab base_area yog thaj tsam peb sab