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Video: Yuav ua li cas koj pom qhov nruab nrab thiab nruab nrab ntawm daim duab peb sab?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Mus nrhiav tus centroid ntawm ib daim duab peb sab , nws yog qhov yooj yim tshaj los kos tag nrho peb cov neeg nruab nrab thiab nrhiav lawv qhov chaw ntawm kev sib tshuam. Kos tus nruab nrab ntawm a daim duab peb sab , xub nrhiav qhov nruab nrab ntawm ib sab ntawm lub daim duab peb sab . Kos ib kab ntu uas txuas qhov taw tes no mus rau qhov rov qab vertex.
Ua kom pom qhov no, koj yuav pom qhov nruab nrab ntawm kab ntu li cas?
Cov qhov nruab nrab yog qhov point ntawm qhov ntu ib nrab ntawm cov ntsiab lus kawg. Nws yuav yog rooj plaub uas tus midpoint ntawm ib ntu tuaj yeem nrhiav tau yooj yim los ntawm kev suav. Yog tias ntu yog kab rov tav lossis ntsug, koj tuaj yeem nrhiav qhov nruab nrab los ntawm kev faib qhov ntev ntawm cov ntu los ntawm 2 thiab suav tus nqi ntawd los ntawm ib qho ntawm qhov kawg.
Kuj Paub, Kuv yuav nrhiav qhov nruab nrab li cas? Cov nruab nrab kuj yog tus naj npawb uas yog ib nrab ntawm lub teeb. Rau nrhiav tus nruab nrab , cov ntaub ntawv yuav tsum tau teem nyob rau hauv kev txiav txim los ntawm tsawg mus rau loj tshaj. Yog hais tias muaj ib tug txawm tus naj npawb ntawm cov khoom nyob rau hauv cov ntaub ntawv teev, ces tus nruab nrab pom los ntawm kev noj qhov nruab nrab (nruab nrab) ntawm ob tus lej nruab nrab.
Koj pom qhov nruab nrab li cas?
Nruab nrab ntawm ib kab Segment
- Ntxiv ob qho tib si "x", faib los ntawm 2.
- Ntxiv ob qho "y" coordinates, faib los ntawm 2.
Yuav 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.
Pom zoo:
Yuav ua li cas koj pom tus nqi ntawm cosine ntawm daim duab peb sab?
Hauv txhua daim duab peb sab, lub cosine ntawm lub kaum sab xis yog qhov ntev ntawm sab uas nyob ib sab (A) faib los ntawm qhov ntev ntawm lub hypotenuse (H). Nyob rau hauv ib tug qauv, nws yog sau yooj yim li 'cos'. Feem ntau nco ntsoov li 'CAH' - lub ntsiab lus Cosine yog nyob ib sab ntawm Hypotenuse
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
Yuav ua li cas koj pom qhov ntxeev ntawm daim duab peb sab siv Pythagorean?
Txoj cai daim duab peb sab thiab Pythagorean Theorem Lub Pythagorean Theorem, a2 + b2 = c2, a 2 + b 2 = c 2, tuaj yeem siv los nrhiav qhov ntev ntawm ib sab ntawm txoj cai daim duab peb sab. Sab nraud ntawm lub kaum sab xis yog hu ua hypotenuse (sab c hauv daim duab)
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