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YesterdayiSaidTomorow

Explain how to find the exact value of Sin 30°

  • one year ago
  • one year ago

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  1. pradiv
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    .-9880316241 calculator click on sin(30) = .-9880316241

    • one year ago
  2. YesterdayiSaidTomorow
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    No. I said exact value.

    • one year ago
  3. pradiv
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    it's probably -1 then

    • one year ago
  4. YesterdayiSaidTomorow
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    it's 1/2 but I keep on getting sqrt(3) / 2

    • one year ago
  5. akhaliq99
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    it is 1/2

    • one year ago
  6. YesterdayiSaidTomorow
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    Yes but how do you find it?

    • one year ago
  7. akhaliq99
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    look at until circle

    • one year ago
  8. akhaliq99
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    actually make a triangle

    • one year ago
  9. YesterdayiSaidTomorow
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    |dw:1359948962457:dw|

    • one year ago
  10. akhaliq99
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    then the sides are sqrt(3) and 1 is hypotunuse

    • one year ago
  11. YesterdayiSaidTomorow
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    How do you get 1/2?

    • one year ago
  12. akhaliq99
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    switch 1 and sqrt(3)

    • one year ago
  13. YesterdayiSaidTomorow
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    but why?

    • one year ago
  14. akhaliq99
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    to get 1/2 that is the triangle of 30 degrees look at this http://www.purplemath.com/modules/trig.htm

    • one year ago
  15. YesterdayiSaidTomorow
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    OOOOOOOOOH!! thanks!

    • one year ago
  16. akhaliq99
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    welcome

    • one year ago
  17. akhaliq99
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    memorize unit circle youll need it

    • one year ago
  18. YesterdayiSaidTomorow
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    I can't memorize stuff

    • one year ago
  19. akhaliq99
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    write it out once

    • one year ago
  20. akhaliq99
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    look it up on google

    • one year ago
  21. hammytams
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    my calculator says sin 30 is 0.5

    • one year ago
  22. YesterdayiSaidTomorow
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    help... how do I find sin120?

    • one year ago
  23. akhaliq99
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    sqrt(3)/2

    • one year ago
  24. YesterdayiSaidTomorow
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    but how? Shouldn't it be the same as sin30?

    • one year ago
  25. akhaliq99
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    use unit circle it will make life easy

    • one year ago
  26. akhaliq99
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    its a 30 60 90 triangle

    • one year ago
  27. akhaliq99
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    no sin of 150 is same as 30

    • one year ago
  28. YesterdayiSaidTomorow
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    |dw:1359950275904:dw|

    • one year ago
  29. YesterdayiSaidTomorow
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    s = o / h s = 1 / 2??

    • one year ago
  30. akhaliq99
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    http://www.mathsisfun.com/algebra/trig-interactive-unit-circle.html

    • one year ago
  31. akhaliq99
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    turn on coordinates

    • one year ago
  32. YesterdayiSaidTomorow
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    i don't want to memorize... i want to learn how to do it manually :(

    • one year ago
  33. YesterdayiSaidTomorow
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    what's wrong with my triangle? Is the right angle in the wrong place?

    • one year ago
  34. akhaliq99
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    yes it turned upside down

    • one year ago
  35. YesterdayiSaidTomorow
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    but why? don't you start at 0 degrees? From where do you start?

    • one year ago
  36. akhaliq99
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    this site should explain http://www.mathsisfun.com/sine-cosine-tangent.html

    • one year ago
  37. YesterdayiSaidTomorow
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    OH I GOT IT NOW! Thanks for the site!

    • one year ago
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