anonymous
  • anonymous
One questions! LAW OF SINES ALGEBRA 2
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
1 Attachment
anonymous
  • anonymous
Answer choices: A. 110. 0 degrees B. 153. 9 degrees c. 26.1 degrees D. 70.0 degrees
anonymous
  • anonymous
lol very tricky

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anonymous
  • anonymous
Can you help me?
anonymous
  • anonymous
it says use the law of sines to find angle B, but you cannot find angle B yet
anonymous
  • anonymous
oh
anonymous
  • anonymous
you want to use \[\frac{\sin(B)}{b}=\frac{\sin(A)}{a}\] but you can't because you do not know \(b\)
anonymous
  • anonymous
what you really need to do is find angle C first that you can do using the law of sines, since you know 3 out of the four numbers for the ratio needed
anonymous
  • anonymous
\[\frac{sin(C)}{19}=\frac{\sin(40)}{13}\] is where you have 3 out of the four numbers
anonymous
  • anonymous
so \[\sin(C)=\frac{19\times \sin(40)}{13}\] making \[C=\sin^{-1}\left(\frac{19\times \sin(40)}{13}\right)\]
anonymous
  • anonymous
obviously you need so use some kind of calculator for this i can show you what i use
anonymous
  • anonymous
okay
anonymous
  • anonymous
http://www.wolframalpha.com/input/?i=arcsin%2819sin%2840%29%2F13%29
anonymous
  • anonymous
that is not your final answer of course, that is just C
anonymous
  • anonymous
okay
anonymous
  • anonymous
once you have \(C=69.69^\circ\) you can find \(A\)
anonymous
  • anonymous
you good from there?
anonymous
  • anonymous
Okay, how would I write the equation?
anonymous
  • anonymous
Not quite..
anonymous
  • anonymous
@satellite73
anonymous
  • anonymous
@triciaal pease help!
anonymous
  • anonymous
will you help me? @triciaal
misty1212
  • misty1212
you have two angles right?
misty1212
  • misty1212
the total is 180
misty1212
  • misty1212
\[180-40-69.96\]
misty1212
  • misty1212
oops \[180-40-69.69\]
triciaal
  • triciaal
do you see that Angle C is 70?
triciaal
  • triciaal
Angles in a triangle add up to 180 40 + B + 70 = 180 solve for B
anonymous
  • anonymous
I tried to tag him but hedidn't come back
anonymous
  • anonymous
Yes, I see that angle C is 70
anonymous
  • anonymous
70
triciaal
  • triciaal
sorry I saw that after 2 tags together
anonymous
  • anonymous
is that all? It's just that equation?
triciaal
  • triciaal
that's what I got
anonymous
  • anonymous
okay, thank you for your help!
triciaal
  • triciaal
you are welcome

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