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Video: Koj pom daim duab peb sab Midsegment Theorem li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Daim duab peb sab Midsegment Theorem hais tias kab ntu txuas rau nruab nrab ntawm ob sab ntawm daim duab peb sab yuav ua rau cov khoom nram qab no:
- Cov kab ntu yuav sib npaug mus rau sab thib peb.
- Qhov ntev ntawm txoj kab ntu yuav yog ib nrab ntawm qhov ntev ntawm peb sab.
Ntxiv rau qhov no, Midsegment Theorem yog dab tsi?
Cov Midsegment Theorem hais tias ntu txuas rau nruab nrab ntawm ob sab ntawm ib daim duab peb sab yog parallel rau sab thib peb thiab ib nrab ntev.
Ib sab saum toj no, kuv yuav nrhiav qhov ntev ntawm daim duab peb sab li cas? Pythagoras 'Theorem (Lub Pythagorean Theorem) Lub hypotenuse yog qhov ntev tshaj plaws ntawm sab xis daim duab peb sab , thiab nyob opposite lub kaum sab xis. Yog li, yog tias koj paub cov ntev ntawm ob sab, txhua yam koj yuav tsum ua yog square ob ntev , ntxiv qhov tshwm sim, ces muab lub hauv paus square ntawm cov sum kom tau qhov ntev ntawm lub hypotenuse.
Kuj Paub, koj yuav daws qhov Midsegment li cas?
Kab DE yog qhov nruab nrab ntawm daim duab peb sab ABC
- Nws txuas ob qhov nruab nrab ntawm ob sab ntawm ib daim duab peb sab.
- Nws yog sib npaug rau ib nrab ntawm qhov ntev ntawm lub hauv paus.
- Nws yog parallel rau lub hauv paus.
- Nws tsim ib daim duab peb sab me me nrog tag nrho cov tib lub kaum sab xis ntsuas, ib nrab ntawm ib puag ncig, thiab ib feem plaub ntawm thaj tsam ntawm daim duab peb sab qub.
Yuav ua li cas peb nrhiav tau lub perimeter ntawm ib daim duab peb sab?
Nrhiav qhov Perimeter Thaum Paub Txog Peb Sab Ntev. Nco ntsoov tus qauv rau kev nrhiav tus ib puag ncig ntawm a daim duab peb sab . Rau ib daim duab peb sab nrog rau sab a, b thiab c, lub ib puag ncig P txhais tau tias: P = a + b + c.
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