## anonymous one year ago Determine two pairs of polar coordinates for the point (4, -4) with 0° ≤ θ < 360°.

1. anonymous

@Loser66 please come back lol I don't know how to do these.

2. anonymous

|dw:1437841905162:dw|

3. Loser66

|dw:1437841853187:dw|

4. Loser66

knock knock!!! ???

5. anonymous

sqrt(32) = 5.65?

6. Loser66

yes, but should let it as $$4\sqrt2$$ , ok?

7. anonymous

ok

8. shamim

Do u know Tan(theta)=y/x

9. shamim

Theta=?

10. anonymous

theta = (y/x)/tan?

11. Loser66

Now, positive angle: If I go opposite way of that length, I got that point. What is the angle?? |dw:1437841980575:dw|

12. Loser66

ok, let shanim take over.

13. anonymous

oh lol with my points haha -4/4 = -1 -1 = tan(theta) not sure what to do after this

14. shamim

Theta=tan^-1(-1)=?

15. anonymous

i got -pi/4 which in degrees would be -45

16. anonymous

is that right?

17. shamim

Do u know -45 is equivalent to the angle 360-45=?

18. shamim

Yes u r right!

19. anonymous

315

20. shamim

21. shamim

315 degree is also a right answer

22. anonymous

I need two coordinates though and those aren't together in an answer

23. anonymous

Want me to post the answer choices

24. 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°)

25. anonymous

hi loser66

26. Loser66

@twistnflip still need help?

27. 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

28. Loser66

|dw:1437842744111:dw|

29. anonymous

135

30. 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?

31. Loser66

Now, go directly, not opposite anymore. |dw:1437842950862:dw|

32. anonymous

yep and then the other one is 4 * sqrt(2), 315

33. Loser66

woohooo!! easy, right?

34. anonymous

Yup!

35. anonymous

yeah I am going to close this question, thanks so much guys I have a few more. I'll be back.