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anonymous

  • one year ago

Find the direction angle of v for the following vector. v = -7i - 9j Ok, since we can write this as (-7,-9) and this is a triangle we can use tan a = -9/-7 tan a = 9/7 Ok I need to solve. How do I do that. What I keep coming up with is wrong. Do I just user the \( tan^{-1}(9/7) \)

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  1. anonymous
    • one year ago
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    I need it in degrees

  2. anonymous
    • one year ago
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    \( tan^{-1}(9/7) \) is suppose to be \( \huge tan^{-1} (\frac{9}{7}) \)

  3. anonymous
    • one year ago
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    and once I find that subtract 360?

  4. anonymous
    • one year ago
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    @peachpi

  5. anonymous
    • one year ago
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    @math1234

  6. anonymous
    • one year ago
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    Are you getting 52.1°?

  7. anonymous
    • one year ago
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    Yes, 52.125

  8. anonymous
    • one year ago
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    Then I subtract that by 360, which gives 307.87

  9. anonymous
    • one year ago
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    But this is wrong.

  10. anonymous
    • one year ago
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    I think it has something to do with the quadrant it is in.

  11. anonymous
    • one year ago
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    52.125 is the angle in the 1st quadrant. (-7, -9) is in the 3rd quadrant. You need to add 180.

  12. anonymous
    • one year ago
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    Ah that is it. I knew it had to do with the quadrant lol

  13. anonymous
    • one year ago
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    Yep that was it. I was working with it as in the 4th quadrant.

  14. anonymous
    • one year ago
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    ah ok. it's hard to keep those straight

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spraguer (Moderator)
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