Cov txheej txheem:
Video: Yuav ua li cas koj siv trigonometric ratios mus nrhiav sab lengths?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Nyob rau hauv txhua txoj cai angled daim duab peb sab, rau txhua lub kaum sab xis:
- Cov sib ntawm lub kaum sab xis = lub ntev ntawm qhov opposite sab . tus ntev ntawm lub hypotenuse.
- Lub cosine ntawm lub kaum sab xis = lub ntev ntawm qhov uas nyob ib sab sab . tus ntev ntawm lub hypotenuse.
- Lub tangent ntawm lub kaum sab xis = lub ntev ntawm qhov opposite sab . tus ntev ntawm qhov uas nyob ib sab sab .
Ntawm no, yuav ua li cas koj paub qhov twg trigonometric piv siv?
Muaj peb kauj ruam:
- Xaiv qhov trig ratio siv. - Xaiv qhov kev txhaum, cos, lossis tan los ntawm kev txiav txim siab sab twg koj paub thiab sab twg koj tab tom nrhiav.
- Hloov.
- daws.
- Kauj ruam 1: Xaiv qhov twg trig piv siv.
- Kauj Ruam 2: Hloov.
- Kauj Ruam 3: daws.
- Kauj ruam 1: Xaiv tus trig piv siv.
- Kauj Ruam 2: Hloov.
Tom qab ntawd, lo lus nug yog, ua li cas koj pom 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.
Tsuas yog SOH CAH TOA yog dab tsi?
SOHCAHTOA . Ib txoj hauv kev ntawm kev nco qab yuav ua li cas suav cov sine, cosine, thiab tangent ntawm lub kaum sab xis. SOH sawv cev rau Sine sib npaug sib npaug sib npaug ntawm Hypotenuse. CAH sawv cev rau Cosine sib npaug ntawm Adjacent tshaj Hypotenuse. TOA sawv cev rau Tangent sib npaug sib npaug sib npaug tshaj Adjacent.
Kuv yuav ua li cas thiaj nrhiav tau qhov ntev ntawm daim duab peb sab?
Hauv txoj cai no daim duab peb sab , koj tau txais kev ntsuas rau lub hypotenuse, c, thiab ib ceg, b. Lub hypotenuse yeej ib txwm rov qab lub kaum sab xis thiab nws yog qhov ntev tshaj plaws sab ntawm daim duab peb sab . Rau nrhiav tus ntev ntawm ceg a, hloov qhov paub qhov tseem ceeb rau hauv Pythagorean Theorem. daws rau a2.
Pom zoo:
Yuav ua li cas koj yuav nrhiav tau nyob ze qhov kawg yog nws sab qaum teb ncej nyob?
Teb. Qhov chaw ntawm tus ncej ntawm li hlau nplaum tuaj yeem txiav txim siab los ntawm kev ncua nws dawb. Ib qho kev txwv tsis pub pub dawb bar hlau nplaum ib txwm taw qhia rau sab qaum teb thiab sab qab teb. Qhov kawg uas taw tes rau sab qaum teb yog tus ncej qaum teb ntawm cov hlau nplaum thaum kawg uas cov ntsiab lus mus rau sab qab teb yog tus ncej sab qab teb ntawm cov hlau nplaum
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
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 xam lub sij hawm nws yuav siv sij hawm mus ncig teb chaws?
Kwv yees seb koj yuav mus sai npaum li cas ntawm koj qhov kev mus ncig. Tom qab ntawd, faib koj qhov kev ncua deb ntawm koj qhov nrawm. Qhov no yuav muab rau koj anestimation ntawm koj lub sijhawm mus ncig. Piv txwv li, yog tias koj mus ncig yog 240 mais thiab koj yuav tsav 40 mais ib teev, koj lub sijhawm yuav yog 240/40 = 6hours
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