Txoj cai ntawm cosines tuaj yeem siv los nrhiav qhov ntsuas ntawm lub kaum sab xis lossis ib sab ntawm daim duab peb sab uas tsis yog txoj cai yog peb paub: ob sab thiab lub kaum sab xis ntawm lawv lossis. peb sab thiab tsis muaj kaum.
Puas yog kev txhaum thiab cos ua haujlwm rau txoj cai daim duab peb sab?
Ntsiab Lus: Txawm hais tias qhov loj ntawm daim duab peb sab, cov trigonometric ratios yuav yeej ib txwm muaj tseeb rau cov duab peb sabNco ntsoov peb qhov piv txwv yog hu ua Sine, Cosine, thiab Tangent, thiab lawv sawv cev rau lub hauv paus Trigonometric Ratios, tom qab lo lus Greek rau kev ntsuas daim duab peb sab.
Puas SOH CAH TOA ua haujlwm rau daim duab peb sab tsis yog?
Rau cov duab peb sab sab xis, peb muaj Pythagoras 'Theorem thiab SOHCAHTOA. Txawm li cas los xij, cov qauv no tsis ua haujlwm rau cov duab peb sab tsis yog txoj cai.
Koj puas tuaj yeem daws daim duab peb sab tsis yog?
Nws yuav zoo dua, txawm li cas los xij, kom muaj txoj hauv kev uas peb tuaj yeem siv ncaj qha rau cov duab peb sab tsis yog txoj cai tsis tau ua ntej tsim cov duab peb sab. Ib daim duab peb sab uas tsis yog daim duab peb sab yog ib qho oblique daim duab peb sabKev daws qhov oblique daim duab peb sab txhais tau tias nrhiav kev ntsuas ntawm peb lub kaum ntse ntse thiab tag nrho peb sab.
30 60 90 daim duab peb sab yog dab tsi?
Thiab li ntawd. Lub sab opposite lub kaum sab xis 30 ° yog qhov tsawg tshaj plaws, vim 30 degrees yog lub kaum sab xis me tshaj. Sab nraub qaum ntawm 60 ° lub kaum sab xis yuav yog qhov nruab nrab ntev, vim tias 60 ° yog lub kaum sab xis ntawm qhov nruab nrab ntawm daim duab peb sab.
