can you tell me what's "y"?

- anonymous

can you tell me what's "y"?

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- anonymous

##### 1 Attachment

- anonymous

We know :
KL=b
a=Jl
x=J
So :JKL=JMN

- anonymous

Yes..

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## More answers

- anonymous

|dw:1062968287869:dw|
Can u understand it ?
u can find it easy !

- anonymous

Can u draw u re pic there ?
I think my pic isnt good :)

- anonymous

|dw:1378630991100:dw|

- anonymous

b=5, a=6. x=40 degrees, what is y?

- anonymous

@stupidinmath :
Thanks !:)
Now look !

- anonymous

|dw:1062968699427:dw|

- anonymous

oh okay..

- anonymous

@stupidinmath :What is the x ?(all of that )

- anonymous

my x is 40

- anonymous

OK !
Your right !

- anonymous

Please wait ...

- 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

|dw:1062969214660:dw|

- anonymous

So k2=x
K1=50
Now find y .!

- anonymous

90?

- anonymous

y=pi-40-57.4=82.6

- anonymous

Sorry ..... @E.ali

- anonymous

I don't get it.. pi?

- anonymous

Do you know sin law?

- anonymous

I have to go! take care ... .

- anonymous

are you still need help?

- anonymous

yeah..

- ganeshie8

how did u get x=40 ? and a= 6 ?
are they given, or did u solve them ?

- anonymous

i solved them

- 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

x=40 since it is congruent to

- ganeshie8

who said x is congruent to

- anonymous

@stupidinmath do you have the question

- ganeshie8

yes the actual q if u cud post, that wud help clear things a bit

- anonymous

wait up

- ganeshie8

oki

- anonymous

hope this is clear enough

##### 1 Attachment

- ganeshie8

ok, for the benifit of others the q is this :-
given that, \(\Delta JKL \cong MNL\), find y

- anonymous

Yes yes :)

- ganeshie8

angle K is not given ha ? I see some white space over angle K ?

- anonymous

Nope it is not given. I thought it was 50 but then I'm not sure..

- 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

to solve y, we must knw sin law, i cant think of any other way hmm

- anonymous

sin law TnT We still haven't tackle that but I'll research on it then

- 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

if they dint teach u yet, it is better to wait unitil they start this topic in class :)

- anonymous

hahah, life is hard thank you anyways @ganeshie8 :D

- anonymous

but @ganeshie8 , i didn't understand! we don't have any 90-angle so how can we use sin law?

- ganeshie8

sin law is universal rihgt ? we can use it in any triangle...
where as sin/cos/tan ratios are right triangle specific

- anonymous

so,
|dw:1378635167584:dw|
can we say sin60 = a/c

- anonymous

?

- 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

|dw:1378635334586:dw|

- anonymous

oh, got it!and can you prove this law?

- ganeshie8

we can prove it very easily, i saw @dan815 proving it few days back :)

- 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

we can try and prove sin law, but it wud take som thinking... its not on top of my head hmm

- anonymous

i'm confused! just say how many sin law we have?do we have a cos law like this too?

- 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

they teach sin/cos ratios first,
but sin.cos laws they will teach oly after 11th grade

- anonymous

and what is this law?
|dw:1378635946608:dw|

- ganeshie8

its not sin law.
its called sin ratio

- anonymous

oh!yes,here I found the proof:
http://en.wikipedia.org/wiki/Law_of_sines

- ganeshie8

yeah that proof looks real neat :) thanks for sharing :))

- 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

its fine... thnks you too =)

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