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dessyk

  • 3 years ago

need help im going to draw a triangle and im doing the law of sines so if anyone can help please do cuz im confused.. please click this to helpp

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  1. dessyk
    • 3 years ago
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    |dw:1335063015673:dw|

  2. GT
    • 3 years ago
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    Do you need to find a?

  3. dessyk
    • 3 years ago
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    so let me explain im trying to find a okay c=96.3, b=145.67 , B=39.5degrees, C=74.2degrees,

  4. dessyk
    • 3 years ago
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    law of sines is a/sinA=b/sinB

  5. GT
    • 3 years ago
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    Sine rule says: SinA/a = SinB/b = SinC/c

  6. dessyk
    • 3 years ago
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    okay i understand that waitt why is it sina/a instead of a/sin a

  7. GT
    • 3 years ago
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    SinA/a = Sin(39.5)/145.67 SinA = a*something

  8. GT
    • 3 years ago
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    Because they mean the same thing. A/B = C/D => B/A = D/C

  9. dessyk
    • 3 years ago
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    waitt does it even matter

  10. dessyk
    • 3 years ago
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    okay im not understanding

  11. GT
    • 3 years ago
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    You can find angle A by simply subtracting angles B and C from 180.

  12. dessyk
    • 3 years ago
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    okay i understand which would be 66.8

  13. GT
    • 3 years ago
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    Then, use this: SinA/a = Sin(39.5)/145.67 SinA = a*something SinA/something = a To find a.

  14. GT
    • 3 years ago
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    SinA/a = SinB/b = SinC/c IS SAME AS a/SinA = b/SinB = c/SinC

  15. dessyk
    • 3 years ago
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    but then a would be .00436

  16. GT
    • 3 years ago
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    I am getting 210.5

  17. GT
    • 3 years ago
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    That "something" in my expression is 0.00436. Divide Sin66.8 by that "something" value. Then, you get the value of a.

  18. dessyk
    • 3 years ago
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    really then let me try again...... im still not getting that are you multiplying or dividing

  19. GT
    • 3 years ago
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    SinA/a = Sin(39.5)/145.67 SinA = a*0.00436 a = SinA/0.00436 a = Sin66.8/0.00436 a = 210.5

  20. dessyk
    • 3 years ago
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    im not getting it first you divided than you did something else im so confused

  21. dessyk
    • 3 years ago
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    ok

  22. dessyk
    • 3 years ago
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    i also had another question

  23. GT
    • 3 years ago
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    Post it separately.

  24. dessyk
    • 3 years ago
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    i dont understand

  25. imagreencat
    • 3 years ago
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    Which part don't you understand? :) I can help you.

  26. dessyk
    • 3 years ago
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    okay, so instead of 66.8 its 66.3

  27. dessyk
    • 3 years ago
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    im so fustrated im confusedd

  28. GT
    • 3 years ago
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    Punch it into the calculator and you get slightly different number from 210.5

  29. GT
    • 3 years ago
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    SinA/a = Sin(39.5)/145.67 SinA = a*0.00436 a = SinA/0.00436 a = Sin66.3/0.00436 a = 210

  30. dessyk
    • 3 years ago
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    i neeed helpppp

  31. dessyk
    • 3 years ago
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    i got -47.99

  32. imagreencat
    • 3 years ago
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    Check your calculator first. I'm guessing you're getting different answers because your calculator is not in degree mode. That's why it's treating your angles differently.

  33. dessyk
    • 3 years ago
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    wait no i got -110.05

  34. GT
    • 3 years ago
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    How in the world can a length of a side of a triangle be negative? Can you show the arithmetic you used to get that number?

  35. dessyk
    • 3 years ago
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    yeppp m ycalculator wasnt in degree mode so let me try again

  36. dessyk
    • 3 years ago
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    yayy i got 209.69

  37. GT
    • 3 years ago
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    Good....close enough to 210. :)

  38. dessyk
    • 3 years ago
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    next problem b=58.2 c=68.3 C=51.3 degrees were gunna find a

  39. GT
    • 3 years ago
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    At this point, it is simply plugging in values into that sine rule ratios and cranking out numbers in a calculator. There is not much help you need.

  40. dessyk
    • 3 years ago
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    yeaa but i want to do it my self then have someone do it so i can nn check my answer to make sure its correct

  41. dessyk
    • 3 years ago
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    i got 7105. 88

  42. dessyk
    • 3 years ago
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    is my answer correct thats all im asking

  43. GT
    • 3 years ago
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    It can't be that big.

  44. GT
    • 3 years ago
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    Angles are almost close to each other. So, side lengths have to be close to each other too.

  45. dessyk
    • 3 years ago
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    well i must be doing something wrong but sin68.3/51.3=.018111746

  46. dessyk
    • 3 years ago
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    128.7/.018111746=7105.88

  47. GT
    • 3 years ago
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    b=58.2 c=68.3 C=51.3 degrees SinB/b = SinC/c => SinB = 58.2 * Sin(51.3)/68.3 => SinB = 0.665 B = 41.68

  48. dessyk
    • 3 years ago
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    becuase i couldnt find A or B so i figured they were the same by suntracting 180-51.3

  49. dessyk
    • 3 years ago
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    ohhh ok so u must follow the formula

  50. GT
    • 3 years ago
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    Now that you know B, you find A by doing 180 - 51.3 - 41.68 = 87

  51. dessyk
    • 3 years ago
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    noww i get it

  52. GT
    • 3 years ago
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    SinA/a = SinC/c => a = c * SinA/SinC => a = 68.3 * Sin(87)/Sin(51.3) => a = 87.4

  53. dessyk
    • 3 years ago
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    ok

  54. wombat
    • 3 years ago
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    @dessyk The following variations of Law of Sines are the same: \[\frac{a}{\sin(A)} = \frac{b}{\sin(B)}=\frac{c}{\sin(C)}\] and \[\frac{\sin(A)}{a}=\frac{\sin(B)}{b}=\frac{\sin(C)}{c}\]

  55. GT
    • 3 years ago
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    He got that. :)

  56. wombat
    • 3 years ago
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    ok :)

  57. dessyk
    • 3 years ago
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    hello

  58. GT
    • 3 years ago
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    yeah

  59. dessyk
    • 3 years ago
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    i have another question but hoew did you get 41. sometrhing but i got 45.42

  60. GT
    • 3 years ago
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    You mean for B = 41? I did the inverse sine function on the value 0.665.

  61. dessyk
    • 3 years ago
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    yes, ohh reallyy you see im confused now i thought u just i thought u just took .6650*68.3=45.42

  62. GT
    • 3 years ago
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    Sin(B) = 0.665 => B = inverse sine (0.665). On the calculator, you have to first press 0.665. Then, inv button, then the sin button.

  63. GT
    • 3 years ago
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    That gives you angle B.

  64. dessyk
    • 3 years ago
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    i didnt get that

  65. jatinbansalhot
    • 3 years ago
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    dessyk.. nice drawing.. :) :)

  66. dessyk
    • 3 years ago
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    thank you i guesss lol can yoiu help me!!

  67. jatinbansalhot
    • 3 years ago
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    what is the question

  68. dessyk
    • 3 years ago
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    its up above next problem b=58.2 c=68.3 C=51.3 degrees were gunna find a

  69. dessyk
    • 3 years ago
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    law of sines

  70. jatinbansalhot
    • 3 years ago
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    i didn't see above but u can find it very easily.. the formula is sin a / a = sin b / b = sin c / c or a /sin a = b / sin b = c / sin c use any of them what caters ur problem

  71. dessyk
    • 3 years ago
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    okay but when i tried i started to get fustrated because i wasnt getting the righ tanswer

  72. jatinbansalhot
    • 3 years ago
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    did my answer help u even a bit or not ?

  73. dessyk
    • 3 years ago
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    a little bit its just that i need help going through the process

  74. petewe
    • 3 years ago
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    |dw:1335070736451:dw|

  75. petewe
    • 3 years ago
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    |dw:1335070848159:dw|

  76. petewe
    • 3 years ago
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    get it?

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