anonymous
  • anonymous
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 \( tan^{-1}(9/7) \)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
I need it in degrees
anonymous
  • anonymous
\( tan^{-1}(9/7) \) is suppose to be \( \huge tan^{-1} (\frac{9}{7}) \)
anonymous
  • anonymous
and once I find that subtract 360?

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anonymous
  • anonymous
@peachpi
anonymous
  • anonymous
@math1234
anonymous
  • anonymous
Are you getting 52.1°?
anonymous
  • anonymous
Yes, 52.125
anonymous
  • anonymous
Then I subtract that by 360, which gives 307.87
anonymous
  • anonymous
But this is wrong.
anonymous
  • anonymous
I think it has something to do with the quadrant it is in.
anonymous
  • anonymous
52.125 is the angle in the 1st quadrant. (-7, -9) is in the 3rd quadrant. You need to add 180.
anonymous
  • anonymous
Ah that is it. I knew it had to do with the quadrant lol
anonymous
  • anonymous
Yep that was it. I was working with it as in the 4th quadrant.
anonymous
  • anonymous
ah ok. it's hard to keep those straight

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