Cov txheej txheem:
Video: Koj sau daim duab peb sab zoo li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Daim duab peb sab zoo sib xws yog tias:
- AAA (lub kaum sab xis lub kaum sab xis) Tag nrho peb khub ntawm cov ces kaum sib xws yog tib yam.
- SSS nyob rau hauv tib qho kev faib ua feem (sab sab sab) Tag nrho peb khub ntawm cov sib raug zoo sab yog nyob rau hauv tib qho kev faib ua feem.
- SAS (sab lub kaum sab xis) Ob khub ntawm sab hauv tib qho kev faib ua feem thiab lub kaum sab xis suav sib npaug.
Ntawm no, dab tsi yog tus qauv rau cov duab peb sab zoo sib xws?
Ratios thiab Proportions - Cov duab zoo sib xws - Hauv qhov tob. Yog tias ob yam khoom muaj qhov zoo ib yam, lawv hu ua " zoo sib xws "Thaum ob cov 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 qhia yog zoo sib xws , sib piv lawv cov sib raug zoo sab.
Tom qab, lo lus nug yog, dab tsi yog lub cim rau perpendicular? Ob kab uas sib tshuam thiab tsim cov kaum sab xis yog hu ua perpendicular kab. Cov cim ⊥ yog siv los qhia perpendicular kab. Hauv daim duab, kab l ⊥ kab m.
Tsis tas li ntawd, cov piv txwv zoo sib xws yog dab tsi?
Hauv cov duab peb sab zoo sib xws , sib thooj sab yeej ib txwm nyob rau hauv tib qhov ratio. Rau piv txwv : Daim duab peb sab R thiab S yog zoo sib xws . Cov kaum sib npaug yog cim nrog tib tus lej ntawm arcs.
Puas yog ob daim duab peb sab zoo sib xws?
Yog hais tias peb teev ntawm coj sab ntawm ob daim duab peb sab yog nyob rau hauv proportions, cov daim duab peb sab yog zoo sib xws . Yog ib lub kaum sab xis daim duab peb sab yog congruent rau lub kaum sab xis ntawm lwm tus daim duab peb sab thiab qhov ntev ntawm sab nrog rau cov ces kaum yog nyob rau hauv proportions, lub daim duab peb sab yog zoo sib xws.
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