anonymous
  • anonymous
can you tell me what's "y"?
Mathematics
  • Stacey Warren - Expert brainly.com
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katieb
  • katieb
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anonymous
  • anonymous
1 Attachment
anonymous
  • anonymous
We know : KL=b a=Jl x=J So :JKL=JMN
anonymous
  • anonymous
Yes..

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anonymous
  • anonymous
|dw:1062968287869:dw| Can u understand it ? u can find it easy !
anonymous
  • anonymous
Can u draw u re pic there ? I think my pic isnt good :)
anonymous
  • anonymous
|dw:1378630991100:dw|
anonymous
  • anonymous
b=5, a=6. x=40 degrees, what is y?
anonymous
  • anonymous
@stupidinmath : Thanks !:) Now look !
anonymous
  • anonymous
|dw:1062968699427:dw|
anonymous
  • anonymous
oh okay..
anonymous
  • anonymous
@stupidinmath :What is the x ?(all of that )
anonymous
  • anonymous
my x is 40
anonymous
  • anonymous
OK ! Your right !
anonymous
  • anonymous
Please wait ...
anonymous
  • anonymous
Using sin law, we have Sinx/SinN=b/a --> sinN=sinx*a/b=sin(40)*6/5 --> N= arcsin (sin40*6/5) y = pi - 40 - N
anonymous
  • anonymous
|dw:1062969214660:dw|
anonymous
  • anonymous
So k2=x K1=50 Now find y .!
anonymous
  • anonymous
90?
anonymous
  • anonymous
y=pi-40-57.4=82.6
anonymous
  • anonymous
Sorry ..... @E.ali
anonymous
  • anonymous
I don't get it.. pi?
anonymous
  • anonymous
Do you know sin law?
anonymous
  • anonymous
I have to go! take care ... .
anonymous
  • anonymous
are you still need help?
anonymous
  • anonymous
yeah..
ganeshie8
  • ganeshie8
how did u get x=40 ? and a= 6 ? are they given, or did u solve them ?
anonymous
  • anonymous
i solved them
ganeshie8
  • ganeshie8
how ? wat congruence property did u use, can u show quick pls.. btw, y can be found using sin law as Saeeddiscover mentioned before
anonymous
  • anonymous
x=40 since it is congruent to
ganeshie8
  • ganeshie8
who said x is congruent to
anonymous
  • anonymous
@stupidinmath do you have the question
ganeshie8
  • ganeshie8
yes the actual q if u cud post, that wud help clear things a bit
anonymous
  • anonymous
wait up
ganeshie8
  • ganeshie8
oki
anonymous
  • anonymous
hope this is clear enough
ganeshie8
  • ganeshie8
ok, for the benifit of others the q is this :- given that, \(\Delta JKL \cong MNL\), find y
anonymous
  • anonymous
Yes yes :)
ganeshie8
  • ganeshie8
angle K is not given ha ? I see some white space over angle K ?
anonymous
  • anonymous
Nope it is not given. I thought it was 50 but then I'm not sure..
ganeshie8
  • ganeshie8
ok :) im just copy pasting Saeeddiscover reply above :- ``` Using sin law, we have Sinx/SinN=b/a --> sinN=sinx*a/b=sin(40)*6/5 --> N= arcsin (sin40*6/5) y = pi - 40 - N
ganeshie8
  • ganeshie8
to solve y, we must knw sin law, i cant think of any other way hmm
anonymous
  • anonymous
sin law TnT We still haven't tackle that but I'll research on it then
ganeshie8
  • ganeshie8
ohk, sin law just says, in a triangle, ratios of 'sin of angle' and the side opposite to the angle are constant \(\large \frac{\sin A}{a} = \frac{\sin B}{b} =\frac{\sin C}{c} = k\)
ganeshie8
  • ganeshie8
if they dint teach u yet, it is better to wait unitil they start this topic in class :)
anonymous
  • anonymous
hahah, life is hard thank you anyways @ganeshie8 :D
anonymous
  • anonymous
but @ganeshie8 , i didn't understand! we don't have any 90-angle so how can we use sin law?
ganeshie8
  • ganeshie8
sin law is universal rihgt ? we can use it in any triangle... where as sin/cos/tan ratios are right triangle specific
anonymous
  • anonymous
so, |dw:1378635167584:dw| can we say sin60 = a/c
anonymous
  • anonymous
?
ganeshie8
  • ganeshie8
nopes, thats not sin law... wat we have there is a sin ratio. sin law says this : ratio of 'sin of angle' , and the side opposite to that angle is constant
ganeshie8
  • ganeshie8
|dw:1378635334586:dw|
anonymous
  • anonymous
oh, got it!and can you prove this law?
ganeshie8
  • ganeshie8
we can prove it very easily, i saw @dan815 proving it few days back :)
ganeshie8
  • ganeshie8
just to colclude on Saeed reply, here is the complete solution to the original q, ``` Using sin law, we have Sinx/SinN=b/a --> sinN=sinx*a/b=sin(40)*6/5 --> N= arcsin (sin40*6/5) --> N = 48 y = pi - 40 - N = 180 - 40 - 48 = 92 ```
ganeshie8
  • ganeshie8
we can try and prove sin law, but it wud take som thinking... its not on top of my head hmm
anonymous
  • anonymous
i'm confused! just say how many sin law we have?do we have a cos law like this too?
ganeshie8
  • ganeshie8
yes, we have cos law too.. basically we have oly two things :- 1) sin/cos ratios 2)sin/cos laws both are two different things (atleast when we start...)
ganeshie8
  • ganeshie8
they teach sin/cos ratios first, but sin.cos laws they will teach oly after 11th grade
anonymous
  • anonymous
and what is this law? |dw:1378635946608:dw|
ganeshie8
  • ganeshie8
its not sin law. its called sin ratio
anonymous
  • anonymous
oh!yes,here I found the proof: http://en.wikipedia.org/wiki/Law_of_sines
ganeshie8
  • ganeshie8
yeah that proof looks real neat :) thanks for sharing :))
anonymous
  • anonymous
Thank you!I didn't know a single word of sin/cos/tan/cot laws ! and know I know! Thank you very much :)
ganeshie8
  • ganeshie8
its fine... thnks you too =)

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