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cagliero423

  • one year ago

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!

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  1. welshfella
    • one year ago
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    have you got an example?

  2. Cagliero423
    • one year ago
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    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

  3. welshfella
    • one year ago
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    thats equation RQ = is correct

  4. Cagliero423
    • one year ago
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    Yeah I know because it's in my book but I keep getting 33.9 and the answer is 60.1???

  5. Cagliero423
    • one year ago
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    I type it in just as the equation says.

  6. welshfella
    • one year ago
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    ok calculators vary in the way you enter data with mine if in enter 40 * sin109 / sin 39 it gives me 60.09

  7. Cagliero423
    • one year ago
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    that is seriously exactly what i type into mine? I don't understand hahah

  8. welshfella
    • one year ago
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    with some calculators you need to add angle first then sin

  9. welshfella
    • one year ago
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    try 109 then sine

  10. Cagliero423
    • one year ago
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    Okay hold on

  11. Cagliero423
    • one year ago
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    It says error

  12. welshfella
    • one year ago
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    ok the sin 109 is the way to go try sin 109 then hit exe

  13. Cagliero423
    • one year ago
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    I don't see a button that says exe

  14. welshfella
    • one year ago
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    well whatever button you use to get a result

  15. Cagliero423
    • one year ago
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    Okay I get .8167

  16. welshfella
    • one year ago
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    or does it give you the answer automatically

  17. welshfella
    • one year ago
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    well it should be 0.9455

  18. welshfella
    • one year ago
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    is your calculator set to degrees or radians?

  19. Cagliero423
    • one year ago
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    I have no clue how do I find out???

  20. welshfella
    • one year ago
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    thats the problem!!!

  21. welshfella
    • one year ago
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    i just set mine to radians and got 0.816

  22. welshfella
    • one year ago
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    * 0.8167

  23. Cagliero423
    • one year ago
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    omg, how do I change it to degrees?

  24. welshfella
    • one year ago
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    what make is ur calculator?

  25. Cagliero423
    • one year ago
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    its a TI-84

  26. welshfella
    • one year ago
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    oh i don't know about those . Mines a Casio - maybe you can find a manual on-line.

  27. Cagliero423
    • one year ago
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    Okay, I will do that, you're a life saver I would have never figured that out! haha thank you(:

  28. welshfella
    • one year ago
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    yw

  29. Cagliero423
    • one year ago
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    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??

  30. Cagliero423
    • one year ago
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    and then it's 32*Sin62/30 ?

  31. Cagliero423
    • one year ago
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    @welshfella

  32. welshfella
    • one year ago
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    yes

  33. Cagliero423
    • one year ago
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    Okay but then I get .9418 as my answer?

  34. welshfella
    • one year ago
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    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

  35. Cagliero423
    • one year ago
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    Yeah I found a video on how to do it so i fixed that(:

  36. welshfella
    • one year ago
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    oh ok hold on

  37. Cagliero423
    • one year ago
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    okie

  38. welshfella
    • one year ago
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    sin B = 0.9418 yes

  39. Cagliero423
    • one year ago
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    Okay so then is angle B .9418 degrees? I don't get what to do next

  40. welshfella
    • one year ago
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    no thats the sine of the angle you need the inverse sine on ur calc - its either marked sin-1 or arcsin

  41. Cagliero423
    • one year ago
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    Ohh okay, thank you again, I think that's all I needed to know(:

  42. welshfella
    • one year ago
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    yw

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