Cov txheej txheem:
Video: Dab tsi yog lub kaum sab xis ntsuas hauv daim duab peb sab ABC?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Step-by-step piav qhia:
Nws muab qhov ntawd ABC yog lub kaum sab xis daim duab peb sab uas yog kaum sab xis ntawm C thiab AC = 7 ntiv tes thiab CB = 5 ntiv tes. Yog li ntawd, lub ntsuas ntawm tsis muaj cov ces kaum hauv daim duab peb sab ABC yog 35.5° thiab 54.5° feem.
Ib sab ntawm qhov no, dab tsi yog lub kaum sab xis ntsuas hauv daim duab peb sab ABC?
Step-by-step piav qhia: Nws yog muab rau ntawd ABC yog lub kaum sab xis daim duab peb sab uas yog kaum sab xis ntawm C thiab AC = 7 ntiv tes thiab CB = 5 ntiv tes. Yog li ntawd, lub ntsuas ntawm tsis muaj cov ces kaum hauv daim duab peb sab ABC yog 35.5° thiab 54.5° feem.
Kuj Paub, koj ua li cas nrhiav lub kaum sab xis ntawm daim duab peb sab muab ob sab? "SAS" yog thaum peb paub ob sab thiab cov lub kaum sab xis nruab nrab ntawm lawv. siv Txoj Cai ntawm Cosines los xam qhov tsis paub sab , ces siv Txoj Cai ntawm Sines rau nrhiav tus me ntawm lwm ob lub kaum sab xis , thiab tom qab ntawd siv peb lub kaum sab xis Ntxiv rau 180 ° rau nrhiav kawg lub kaum sab xis.
Kuj tseem paub yog, qhov kev sib npaug twg tuaj yeem siv los daws qhov ntsuas ntawm lub kaum sab xis ABC?
tan(x) = 2.4/10 tan(x) = 10/2.4 sin(x) = 10/10.3 sin(x) = 10.3/10.
Yuav ua li cas koj pom lub kaum sab xis ntawm daim duab peb sab nrog 3 sab?
Txhawm rau daws qhov SSS daim duab peb sab:
- siv Txoj Cai ntawm Cosines ua ntej los xam ib qho ntawm cov ces kaum.
- ces siv Txoj Cai ntawm Cosines dua los nrhiav lwm lub kaum sab xis.
- thiab thaum kawg siv cov ces kaum ntawm daim duab peb sab ntxiv rau 180 ° kom pom lub kaum sab xis kawg.
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
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Dab tsi yog kev sib raug zoo ntawm sab nrauv thiab sab hauv lub kaum sab xis ntawm daim duab peb sab?
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