anonymous
  • anonymous
I got an answer for this trig problem and I want to see if it is correct
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
anonymous
  • anonymous
I know the answer is either approximately 50.3m or approximately 39.3m, but I do not know which one it is
anonymous
  • anonymous
@jim_thompson5910

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IrishBoy123
  • IrishBoy123
did you draw the picture? rough sketch will suffice
anonymous
  • anonymous
i did
IrishBoy123
  • IrishBoy123
|dw:1438642173189:dw|
anonymous
  • anonymous
|dw:1438642164202:dw|
anonymous
  • anonymous
Here is what I did
anonymous
  • anonymous
@mathstudent55
anonymous
  • anonymous
@IrishBoy123 did I solve the problem correctly
IrishBoy123
  • IrishBoy123
why did you not use cos 43 ?
IrishBoy123
  • IrishBoy123
https://www.mathsisfun.com/algebra/trig-cosine-law.html
anonymous
  • anonymous
wait why would it be cos 43
IrishBoy123
  • IrishBoy123
well look at the link just asking
anonymous
  • anonymous
I guess that it is right I think
amistre64
  • amistre64
law of cosine is fine, but i dont know how to read the bearings ...
IrishBoy123
  • IrishBoy123
|dw:1438642650401:dw|
anonymous
  • anonymous
So my new equation is \[d=\sqrt{30^2+34^2-2(30)(24)(\cos(43}))\]
IrishBoy123
  • IrishBoy123
yes but that has to make sense to you.... again http://mathworld.wolfram.com/LawofCosines.html
IrishBoy123
  • IrishBoy123
and typo (!) : \(34^2 -> 24^2\)
anonymous
  • anonymous
Your graph made better sense than the link, thank you though, therefore my new anser should be, 20.6m
IrishBoy123
  • IrishBoy123
if **you** are happy with it in the attached diagram we can say - from Law of Cosines - that \( \large a^2 = b^2 + c^2 - 2 b c\ cos A\) |dw:1438643019135:dw|
anonymous
  • anonymous
ok so is my new anser 20.6m
IrishBoy123
  • IrishBoy123
|dw:1438643119009:dw| and \(b^2 = a^2 + c^2 - 2ac \ cos B\)
IrishBoy123
  • IrishBoy123
it is Pythagoreas expanded |dw:1438643242132:dw| so \(\large c^2 = a^2 + b^2 - 2ab \ cos C\)
anonymous
  • anonymous
ok, but can you confirm that I have the right answer
IrishBoy123
  • IrishBoy123
and yes i seem to agree with you
anonymous
  • anonymous
ok so the answer to my original problem is20.6
IrishBoy123
  • IrishBoy123
i should think so
IrishBoy123
  • IrishBoy123
|dw:1438643502160:dw| look at this, where C = 90 \(c^2 = a^2 + b^2 - 2ab \ cos C = a^2 + b^2 - 2ab \ (0)\) \(c^2 = a^2 + b^2\)
anonymous
  • anonymous
Can you help me with a simpler problem that I also dont know whether I got right or wrong
anonymous
  • anonymous
@jdoe0001
jdoe0001
  • jdoe0001
repost anew, thus more eyes :)
jdoe0001
  • jdoe0001
20.6 is correct btw
anonymous
  • anonymous
ok

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