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Trigonometry Problem - 50 Frih$





melissareich


Solve and get 50 Frih$ Smile
Round to the nearest tenth!
Peterssidan
sin 115 / x = sin 40 / 3
x = 4.23

By tenth is that 1/10.
if you I have rounded wrong x = 4.229893856
melissareich
Corrrrect! Smile

x = 4.2
^what I meant by tenth
Peterssidan
oh.. I rounded wrong because I thought wrong but the important thing is that the answer was correct.

Thanks for the 50 Frih$! Dancing
imagefree
Peterssidan wrote:
sin 115 / x = sin 40 / 3
x = 4.23

By tenth is that 1/10.
if you I have rounded wrong x = 4.229893856


well i am a littlebit confuse here (i am not good at trignometry), can you please tell me how is this solution?

I personally feel the answer should be 4.7 Confused
Gushe
Me too..
Well, it might be stupid, but can't you use Cosinus and Sinus etc only in triangles with 1 ninety degree corner..? Smile that's wa we learnt I think..
(srry for my bad english Razz)
Peterssidan
It's the Law of sines.
dac_nip
very simple dude. Its the LAW of SINES.. hayy. it was already answered..
melissareich
Yes it was the Law of Sines, this particular triangle is AngleSideSide.

You initially had to draw 2 different triangles, there could have been 2 different answers, but the second triangle equalled more than 180.



Edit, to answer your question:

Gushe wrote:
Me too..
Well, it might be stupid, but can't you use Cosinus and Sinus etc only in triangles with 1 ninety degree corner..? Smile that's wa we learnt I think..
(srry for my bad english Razz)


You cannot use Law of Cosines because these are not right triangles, they are Oblique triangles.
Gushe
Well.. I'm only 14 years old Razz And I'm in fourth grade (It's appareantly different than in US etc..) and we didn't learn it yet.. though I could have tried Smile


~Gushe
rvec
you could've solved it one sec i'll show how.

sin115=BD/3
BD=sin115*3
sin40=BD/x
x=BD/sin40=3,8

eeeh maybe not
edit:
lol my calculator still did radials
sin115=BD/3
BD=sin115*3
sin40=BD/x
x=BD/sin40=4,2 Very Happy
mtorregiani
Quite easy.
May I suggest a new one?



Find the angle X

Winner gets 50 frih$


PS: I love Trigonometry!
Peterssidan
If sen is the same as sinus

1 - (cos x)^2 - cos x - 1 = 0
(cos x)^2 + cos x = 0
x = pi

or if you want it in degrees: x = 180
mtorregiani
Great

Yes, sen is sinus.

frih$ 50 donated to Peterssidan.

Someone else, please, start another.

Edit: In fact, the correct answer is the following (with n, which is a natural number)
180 +/- n x 360 (example, 1260 is still correct, 1260 = 180 + (3 x 360) )
60 +/- n x 360

Sorry for my bad english, I supose you understood me.
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