Cov txheej txheem:
Video: Koj daws cov duab peb sab li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Hauv koj lub thawv daws teeb meem (nrog rau koj tus cwj mem, ntawv thiab lub tshuab xam zauv) koj muaj 3 qhov sib npaug:
- Cov ces kaum ib txwm ntxiv rau 180 °: A + B + C = 180 °
- Txoj Cai ntawm Sines (Lub Sine Txoj Cai): Thaum muaj lub kaum sab xis ntawm ib sab, qhov kev sib npaug no los rau kev cawm.
- Txoj Cai ntawm Cosines (Cov Cai Cosine):
Tib neeg kuj nug tias, daws daim duab peb sab txhais li cas?
daws daim duab peb sab Nws txhais tau tias tias yog peb muab qee qhov tseeb txog ib daim duab peb sab , peb tuaj yeem nrhiav tau qee qhov lossis tag nrho cov seem. Ua kom tiav daws ib daim duab peb sab feem ntau nws txhais tau tias nrhiav txhua yam ntawm nws - tag nrho peb sab thiab tag nrho peb lub ces kaum. Tab sis feem ntau peb tsuas yog txaus siab rau ib qho tsis paub txog qhov daim duab peb sab.
Ib sab saum toj no, koj pom qhov degree ntawm lub kaum sab xis li cas? Rau xam cov ces kaum nyob rau hauv ib tug polygon, ua ntej kawm koj li cas lub kaum sab xis ntxiv rau thaum summed, zoo li 180 qib nyob rau hauv daim duab peb sab los yog 360 qib hauv quadrilateral. Thaum koj paub dab tsi lub lub kaum sab xis ntxiv mus, ntxiv ua ke lub lub kaum sab xis koj paub, ces rho cov lus teb los ntawm tag nrho cov kev ntsuas ntawm lub lub kaum sab xis rau koj lub cev.
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.
Yuav ua li cas koj thiaj nrhiav tau lub kaum sab xis uas ploj lawm?
Txhawm rau txiav txim siab ntsuas qhov tsis paub lub kaum sab xis , nco ntsoov siv tag nrho cov lej ntawm 180 °. Yog ob lub kaum sab xis muab, ntxiv rau lawv ua ke thiab rho tawm ntawm 180 °. Yog ob lub kaum sab xis yog tib yam thiab tsis paub, rho tawm cov paub lub kaum sab xis ntawm 180 ° thiab ces faib los ntawm 2.
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
Cov kws kos duab hu li cas cov duab thiab cov duab siv los sawv cev rau cov yam ntxwv ntawm lub ntiaj teb nto?
Ntiaj Teb Kev Tshawb Fawb - Daim Ntawv Qhia Lub Ntiaj Teb Qhov Nto A B GLOBE Ib puag ncig uas sawv cev rau lub ntiaj teb nto. SCALE Siv los sib piv qhov deb ntawm daim ntawv qhia lossis lub ntiaj teb mus deb ntawm lub ntiaj teb nto. SYMBOLS Ntawm daim duab qhia chaw, cov duab siv los ntawm mapmakers sawv ntsug rau cov yam ntxwv ntawm lub ntiaj teb nto. TSEEM CEEB Ib daim ntawv teev cov cim siv rau ntawm daim ntawv qhia
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