anonymous
  • anonymous
find angle A if side a=34 side b=28 and side c=15 need help bad please help me
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
|dw:1332811985103:dw| do you know the Law of Cosines?
anonymous
  • anonymous
no
anonymous
  • anonymous
there are actually 3 but they're all basically the same... since you want Angle A, i'll write it out for you in it's most common form: a^2 = b^2 + c^2 -2abcosA

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anonymous
  • anonymous
using this formula, solve for cosA... what do you have?
anonymous
  • anonymous
34 is cos a
anonymous
  • anonymous
forget about the lengths given for now... solve for cosA in terms of a, b, c.
anonymous
  • anonymous
ok so if I have a 34 b 28 and c 15 would i have to times them all by their number again
anonymous
  • anonymous
this gives you cosA. Do you know how to find A from here?
anonymous
  • anonymous
ya so if I add bsquared and c swuared I would get 666
anonymous
  • anonymous
b^2 + c^2 = 666 ?
anonymous
  • anonymous
ok I have no idea how to do it can you just do it really quick so I can learn from you how to do it please that would help a lot
anonymous
  • anonymous
hang on, there's a problem here...
anonymous
  • anonymous
|dw:1332812914165:dw| ok, that should be it.
anonymous
  • anonymous
hold on im trying to figure it out
anonymous
  • anonymous
|dw:1332813025166:dw|
anonymous
  • anonymous
ok, that's better. can you calculate the right side?
anonymous
  • anonymous
I cant see the end of what u typed
anonymous
  • anonymous
|dw:1332813268074:dw|
anonymous
  • anonymous
where?
anonymous
  • anonymous
the end numbers I cant see what they say
anonymous
  • anonymous
|dw:1332813388205:dw| here?
anonymous
  • anonymous
i still cant see the end numbers lol not sure why
anonymous
  • anonymous
ok so its 2 28 and i cant see the last one
anonymous
  • anonymous
|dw:1332813456241:dw| these are just the given values for a, b, and c
anonymous
  • anonymous
dude i cant see the end numbers can u just tell me the answer i dont kno why the end is not poping up
anonymous
  • anonymous
|dw:1332813552368:dw| your job now is to find A knowing the cosine of A
anonymous
  • anonymous
can you at least do this?
anonymous
  • anonymous
ok, 100 degrees.

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