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20Sin(70)= 18.79385
wait... that doesn't seem right

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Other answers:

testingtutor, could you double check that?
20 cosec 70° ?
ya, i think that is it
and turing...
The length 'opposite' is 20, what we are looking for is the hypotenuse
I was not trying to break the CoC, I thought I had explained it....
And we know that's a sine. \[\sin70 = \frac{20}{Hypotenuse}\]
Hence, \[Hypotenuse = \frac{20}{sin70}\]
|dw:1335992360468:dw|\[\tan\theta=\frac ab\implies b=\frac a{\tan\theta}\]
and @DoomDude a one-line answer is insufficient here
so, it has to be more than one line? LAST problem she asked I explaind why you would use sin and not cos ect.. gave her this link http://www.mathsisfun.com/sine-cosine-tangent.html and then solved it! She already had that info for this one...
I chose A, is it wrong
^so that is why you need top check the askers understanding before providing the answer
to check*
ok... will do next time, i was just a bit shocked that I was breaking a rule...
it's okay, just please try a little harder to make it so \(they\) give the correct answer, not you
ok...

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