Cov txheej txheem:
Video: Yuav ua li cas koj nrhiav tau tus kab pheeb ces kaum ntawm txoj cai kaum sab xis?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Nrhiav qhov ntev ntawm lub kab pheeb ces kaum (orhypotenuse) ntawm a txoj cai daim duab peb sab , hloov qhov ntev ntawm ob sab perpendicular rau hauv cov qauv a2 +b2 = c2, qhov twg a thiab b yog qhov ntev ntawm sab perpendicular thiab c yog qhov ntev ntawm lub hypotenuse.
Xav txog qhov no, koj ua li cas xam tus kab pheeb ces kaum?
Yuav nrhiav tau kab pheeb ces kaum ntawm ib daim duab plaub, koj tuaj yeem faib cov duab plaub rau hauv ob daim duab peb sab, piv txwv li, daim duab peb sab nrog ib lub kaum ntawm 90 °. Txhua daim duab peb sab yuav muaj ob sab ntawm qhov ntev l thiab w thiab ib qho hypotenuse ntawm qhov ntev d.
Tsis tas li ntawd, lub diagonal ntawm daim duab peb sab yog dab tsi? Hauv lwm lo lus, lub ntsiab lus uas cov kab pheeb ces kaum sib tshuam (hla), faib txhua kab pheeb ces kaum ua ob qhov sib npaug. Txhua kab pheeb ces kaum faib cov duab plaub rau hauv ob qho tib si txoj cai daim duab peb sab . Vim lub daim duab peb sab yog congruent, lawv muaj tib cheeb tsam, thiab txhua daim duab peb sab muaj ib nrab ntawm thaj tsam ntawm daim duab plaub.
Ntawm no, ua li cas koj pom cov kaum sab xis ntawm daim duab peb sab?
Ntsiab Cai
- Lub Pythagorean Theorem, a2 + b2 = c2, a 2 + b 2 = c 2, yog siv los nrhiav qhov ntev ntawm ib sab ntawm daim duab peb sab.
- Nyob rau hauv daim duab peb sab txoj cai, ib lub kaum sab xis muaj tus nqi ntawm 90degrees.
- Qhov ntev tshaj plaws ntawm daim duab peb sab yog hu ua lub hypotenuse, thiab nws yog sab uas yog opposite lub kaum sab xis 90 degree.
Dab tsi yog kab pheeb ces kaum thiab piv txwv?
Lub ntsiab txhais ntawm kab pheeb ces kaum yog ib yam dab tsi withslanted kab los yog ib txoj kab uas txuas ib ces kaum nrog rau cornerfurthest deb. Ib piv txwv ntawm kab pheeb ces kaum yog ib txoj kab mus los ntawm lub kaum sab laug hauv qab ntawm ib lub xwmfab mus rau sab xis saum toj kawg nkaus. YourDictionary txhais thiab kev siv piv txwv.
Pom zoo:
Yuav ua li cas koj nrhiav tau daim ntawv tivthaiv ntawm ib vector muab qhov magnitude thiab lub kaum sab xis?
VIDEO Khaws qhov no hauv kev xav, puas yog 0 ib chav vector? A unit vector yog a vector uas muaj qhov loj ntawm 1. Cov ntawv sau sawv cev rau tus qauv, lossis qhov loj, ntawm vector v. Basic unit vectors yog i = (1, 0 ) thiab j = ( 0 , 1) uas yog ntev 1 thiab muaj cov lus qhia raws qhov zoo x-axis thiab y-axis feem.
Cov kab lus hloov sab hauv cov ces kaum piav qhia txoj haujlwm ntawm ob lub kaum sab xis li cas?
Hloov sab hauv cov ces kaum yog tsim los ntawm ib tug transversal intersecting ob parallel kab. Lawv nyob nruab nrab ntawm ob qho tib si kab tab sis nyob rau sab nraud ntawm lub transversal, tsim ob khub (plaub tag nrho cov ces kaum) ntawm cov ces kaum sab hauv. Hloov cov ces kaum sab hauv yog congruent, txhais tau tias lawv muaj qhov sib npaug
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
Yuav ua li cas muaj pes tsawg tus tooj liab atoms koj yuav tsum tau kab ntawm ib sab los tsim ib kab 1'm ntev?
Los ntawm kev sib piv, lub ntiaj teb cov pej xeem tsuas yog hais txog 7? 109 neeg. Yog tias koj tuaj yeem ua kab 100,000,000 tooj liab atoms ib sab, lawv yuav tsim ib txoj kab ntev li 1 cm
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