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Mathematics 21 Online
OpenStudy (highschoolmom2010):

Law of sine question :DD

OpenStudy (highschoolmom2010):

OpenStudy (akashdeepdeb):

Why do you have a question if you know what the law of sines is?

OpenStudy (highschoolmom2010):

im not sure if i am doing it right

OpenStudy (akashdeepdeb):

You are!

OpenStudy (cwrw238):

for a triangle ABC a/ sinA = b/sinB = c/sinC

OpenStudy (highschoolmom2010):

|dw:1377962024865:dw| \[\frac{ \sin 80 }{ 17 }=\frac{ \sin Z }{ 14 }\]

OpenStudy (highschoolmom2010):

like that ????

OpenStudy (cwrw238):

yes

OpenStudy (highschoolmom2010):

14(sin 80) = 17(sin 17)

OpenStudy (highschoolmom2010):

\[\frac{ 14 \sin 80 }{ 17 }=\frac{ 17 \sin Z }{ 17 }\]

OpenStudy (highschoolmom2010):

whats where im lost

terenzreignz (terenzreignz):

^_^ You're actually doing great :) Now, 17 cancels out here: \[\frac{ 14 \sin 80 }{ 17 }=\frac{ \cancel{17} \sin Z }{ \cancel{17} }\]

terenzreignz (terenzreignz):

and we get... \[\Large \sin Z = \frac{14\sin 80^o}{17}\]

OpenStudy (highschoolmom2010):

but i plugged the remaining in calculator and got a crazy answer

terenzreignz (terenzreignz):

What was it? ^_^

OpenStudy (highschoolmom2010):

0.81101814953

OpenStudy (highschoolmom2010):

that cant be right

terenzreignz (terenzreignz):

Ahh... I see. Because what you got was the SINE of the angle Z :) You have to run it through \(\large \sin^{-1}\) to get the angle Z itself ^_^ \[\Large Z = \sin^{-1}\left(\frac{14\sin 80^o}{17}\right)\]

OpenStudy (highschoolmom2010):

oh i forgot to do teh inverse

terenzreignz (terenzreignz):

There's your problem ^_^ I trust it no longer IS a problem? :D

OpenStudy (highschoolmom2010):

let me try that and see what i get '

terenzreignz (terenzreignz):

I'm sure it'll be more... believable... this time around ^_^

OpenStudy (highschoolmom2010):

54.1955269839

terenzreignz (terenzreignz):

More reasonable, don't you think? ^_^

terenzreignz (terenzreignz):

Correct, by the way :D

OpenStudy (highschoolmom2010):

thanks for the clarification :D

terenzreignz (terenzreignz):

No problem ^_^

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