BloomLocke367
  • BloomLocke367
Law of cosines
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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BloomLocke367
  • BloomLocke367
|dw:1432929186134:dw| I'm looking for angle A.
BloomLocke367
  • BloomLocke367
@IrishBoy123
IrishBoy123
  • IrishBoy123
|dw:1432929324519:dw| OK :p

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BloomLocke367
  • BloomLocke367
that's confusing
BloomLocke367
  • BloomLocke367
i'm confused
IrishBoy123
  • IrishBoy123
@BloomLocke367 for law of cosines, think Pythagoreas Theorem with added power if you want to understand it, that's where to start. if you just want the answer, there will be no limit to the amount of online calculators that will do the work for you. otherwise, you have to walk the long mile.
IrishBoy123
  • IrishBoy123
|dw:1432930383845:dw|
BloomLocke367
  • BloomLocke367
so what exactly do I do with that?
IrishBoy123
  • IrishBoy123
to solve \[a^2 = b^2 + c^2 - 2 \ b \ c \ \cos A\] calculate \[a^2 ,\ b^2, \ c^2 \ and \ 2 bc\] you have all the data cos(A) follows from that
BloomLocke367
  • BloomLocke367
so I have289=484+900-1320cosA
BloomLocke367
  • BloomLocke367
@IrishBoy123
IrishBoy123
  • IrishBoy123
awesome
IrishBoy123
  • IrishBoy123
i agree
BloomLocke367
  • BloomLocke367
now what do I do?
IrishBoy123
  • IrishBoy123
\[1320 \ cosA = 484 + 900 - 289 ;\ \ \ cosA = \frac{484 + 900 - 289}{1320} \]
IrishBoy123
  • IrishBoy123
cos A = ?? if it's not 33.948, you can sack me.
BloomLocke367
  • BloomLocke367
I got 0.829...
IrishBoy123
  • IrishBoy123
good because if cos A = 0.829..., then A = 33.948 [degrees]
BloomLocke367
  • BloomLocke367
how so?
IrishBoy123
  • IrishBoy123
try this https://www.google.co.uk/search?q=google+calculator&rlz=1C5CHFA_enGB524GB524&oq=google+calculator&aqs=chrome..69i57j0j5j0j69i64.6310j0j1&sourceid=chrome&ie=UTF-8
BloomLocke367
  • BloomLocke367
Can you help with some more?
IrishBoy123
  • IrishBoy123
@BloomLocke367 gotta go well done, you can do this stuff easily ciao!

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