Cov txheej txheem:
Video: Koj yuav daws li cas rau ob daim duab peb sab?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Kev daws SSA Daim duab peb sab
- siv Txoj Cai ntawm Sines ua ntej los xam ib qho ntawm lwm tus ob kaum sab xis;
- tom qab ntawd siv peb lub kaum sab xis ntxiv rau 180 ° kom pom lwm qhov lub kaum sab xis ;
- Thaum kawg siv Txoj Cai ntawm Sines dua kom pom qhov tsis paub.
Tsuas yog li ntawd, koj yuav nrhiav tau qhov kev daws thib 2 ntawm daim duab peb sab li cas?
Txhawm rau txiav txim siab seb puas muaj 2 lub kaum sab xis siv tau:
- Saib seb koj puas tau muab ob sab thiab lub kaum sab xis tsis nyob nruab nrab (SSA).
- Nrhiav tus nqi ntawm lub kaum sab xis tsis paub.
- Thaum koj pom tus nqi ntawm koj lub kaum sab xis, rho tawm ntawm 180 ° kom pom lub kaum sab xis thib ob.
- Ntxiv lub kaum sab xis tshiab rau lub kaum sab xis qub.
Tsis tas li ntawd, ua li cas rau koj nrhiav thaj tsam ntawm daim duab peb sab? Rau nrhiav tus cheeb tsam ntawm a daim duab peb sab , muab lub hauv paus los ntawm qhov siab, thiab muab faib los ntawm 2. Kev faib los ntawm 2 los ntawm qhov tseeb tias ib qho parallelogram tuaj yeem muab faib ua 2 daim duab peb sab . Piv txwv li, nyob rau hauv daim duab mus rau sab laug, lub cheeb tsam ntawm txhua tus daim duab peb sab yog sib npaug rau ib nrab ntawm cheeb tsam ntawm parallelogram.
Nyob rau hauv no hais txog, Heron lub cheeb tsam formula yog dab tsi?
Hauv geometry, Heron tus qauv (qee zaus hu ua Hero's qauv ), lub npe hu ua Hero of Alexandria, muab lub cheeb tsam ntawm ib daim duab peb sab thaum qhov ntev ntawm tag nrho peb sab paub. Tsis zoo li lwm daim duab peb sab cheeb tsam formulae, tsis tas yuav suav cov ces kaum lossis lwm qhov kev ncua deb hauv daim duab peb sab ua ntej.
Cpctc sawv cev rau dab tsi?
qhov sib thooj ntawm daim duab peb sab congruent yog congruent
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