anonymous
  • anonymous
Determine two pairs of polar coordinates for the point (4, -4) with 0° ≤ θ < 360°.
Mathematics
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anonymous
  • anonymous
Determine two pairs of polar coordinates for the point (4, -4) with 0° ≤ θ < 360°.
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
@Loser66 please come back lol I don't know how to do these.
anonymous
  • anonymous
|dw:1437841905162:dw|
Loser66
  • Loser66
|dw:1437841853187:dw|

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Loser66
  • Loser66
knock knock!!! ???
anonymous
  • anonymous
sqrt(32) = 5.65?
Loser66
  • Loser66
yes, but should let it as \(4\sqrt2\) , ok?
anonymous
  • anonymous
ok
shamim
  • shamim
Do u know Tan(theta)=y/x
shamim
  • shamim
Theta=?
anonymous
  • anonymous
theta = (y/x)/tan?
Loser66
  • Loser66
Now, positive angle: If I go opposite way of that length, I got that point. What is the angle?? |dw:1437841980575:dw|
Loser66
  • Loser66
ok, let shanim take over.
anonymous
  • anonymous
oh lol with my points haha -4/4 = -1 -1 = tan(theta) not sure what to do after this
shamim
  • shamim
Theta=tan^-1(-1)=?
anonymous
  • anonymous
i got -pi/4 which in degrees would be -45
anonymous
  • anonymous
is that right?
shamim
  • shamim
Do u know -45 is equivalent to the angle 360-45=?
shamim
  • shamim
Yes u r right!
anonymous
  • anonymous
315
shamim
  • shamim
-45 degree is right answer!!
shamim
  • shamim
315 degree is also a right answer
anonymous
  • anonymous
I need two coordinates though and those aren't together in an answer
anonymous
  • anonymous
Want me to post the answer choices
anonymous
  • anonymous
Here: (4 sqrt(2), 45°), (-4 sqrt(2), 225°) (4 sqrt(2), 135°), (-4 sqrt(2), 315°) (4 sqrt(2), 225°), (-4 sqrt(2), 45°) (4 sqrt(2), 315°), (-4 sqrt(2), 135°)
anonymous
  • anonymous
hi loser66
Loser66
  • Loser66
@twistnflip still need help?
anonymous
  • anonymous
yeah I can't figure out which answer it is supposed to be, I thought -45 and 315 but those aren't together in any of the choices
Loser66
  • Loser66
|dw:1437842744111:dw|
anonymous
  • anonymous
135
Loser66
  • Loser66
ok, that is if you go there, but the opposite way of that direction, you get (4,-4) Hence the first one is (\(-4\sqrt{2}, 135\)), ok?
Loser66
  • Loser66
Now, go directly, not opposite anymore. |dw:1437842950862:dw|
anonymous
  • anonymous
yep and then the other one is 4 * sqrt(2), 315
Loser66
  • Loser66
woohooo!! easy, right?
anonymous
  • anonymous
Yup!
anonymous
  • anonymous
yeah I am going to close this question, thanks so much guys I have a few more. I'll be back.

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