cagliero423
  • cagliero423
Law of Sines help??? So I have a project and I have to find the measures of angles B and C on all these triangles. They give me measure A and what a and b equal and I know that sinA/a= SinB/b = SinC/c but every time I try and use this it doesn't work out, even when I have an example in my book and I type it into my calculator I get a different answer than the book and I'm just trying to understand what I'm doing wrong. Help would be appreciated!
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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welshfella
  • welshfella
have you got an example?
cagliero423
  • cagliero423
Like in the book there is an equation and it says sin 109/RQ=sin39/40 RQ= 40 sin109/sin39 which is about 60.1 cm but when I type it into my calculator I get 33.9
welshfella
  • welshfella
thats equation RQ = is correct

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cagliero423
  • cagliero423
Yeah I know because it's in my book but I keep getting 33.9 and the answer is 60.1???
cagliero423
  • cagliero423
I type it in just as the equation says.
welshfella
  • welshfella
ok calculators vary in the way you enter data with mine if in enter 40 * sin109 / sin 39 it gives me 60.09
cagliero423
  • cagliero423
that is seriously exactly what i type into mine? I don't understand hahah
welshfella
  • welshfella
with some calculators you need to add angle first then sin
welshfella
  • welshfella
try 109 then sine
cagliero423
  • cagliero423
Okay hold on
cagliero423
  • cagliero423
It says error
welshfella
  • welshfella
ok the sin 109 is the way to go try sin 109 then hit exe
cagliero423
  • cagliero423
I don't see a button that says exe
welshfella
  • welshfella
well whatever button you use to get a result
cagliero423
  • cagliero423
Okay I get .8167
welshfella
  • welshfella
or does it give you the answer automatically
welshfella
  • welshfella
well it should be 0.9455
welshfella
  • welshfella
is your calculator set to degrees or radians?
cagliero423
  • cagliero423
I have no clue how do I find out???
welshfella
  • welshfella
thats the problem!!!
welshfella
  • welshfella
i just set mine to radians and got 0.816
welshfella
  • welshfella
* 0.8167
cagliero423
  • cagliero423
omg, how do I change it to degrees?
welshfella
  • welshfella
what make is ur calculator?
cagliero423
  • cagliero423
its a TI-84
welshfella
  • welshfella
oh i don't know about those . Mines a Casio - maybe you can find a manual on-line.
cagliero423
  • cagliero423
Okay, I will do that, you're a life saver I would have never figured that out! haha thank you(:
welshfella
  • welshfella
yw
cagliero423
  • cagliero423
Okay could you help me with something really quick actually? I just want to make sure I'm doing this right. my first equation I have angle A= 62 degrees a= 30 and b=32. So if I'm trying to find angle B I set it up like Sin62/30=SinB/32 right??
cagliero423
  • cagliero423
and then it's 32*Sin62/30 ?
cagliero423
  • cagliero423
@welshfella
welshfella
  • welshfella
yes
cagliero423
  • cagliero423
Okay but then I get .9418 as my answer?
welshfella
  • welshfella
By the way - i used to have a TI a long way back - i remember you changed degrees to radians and vise versa using the MODE key
cagliero423
  • cagliero423
Yeah I found a video on how to do it so i fixed that(:
welshfella
  • welshfella
oh ok hold on
cagliero423
  • cagliero423
okie
welshfella
  • welshfella
sin B = 0.9418 yes
cagliero423
  • cagliero423
Okay so then is angle B .9418 degrees? I don't get what to do next
welshfella
  • welshfella
no thats the sine of the angle you need the inverse sine on ur calc - its either marked sin-1 or arcsin
cagliero423
  • cagliero423
Ohh okay, thank you again, I think that's all I needed to know(:
welshfella
  • welshfella
yw

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