anonymous
  • anonymous
Convert (-5, pi/4) to rectangular coordinates. A. (sqrt(2) / 2, sqrt(2) / 2) B. (5 sqrt(3) / 2, 5/ 2) C. (5 sqrt(2) / 2, 5 sqrt(2) / 2) D. (-5 sqrt(2) / 2, -5 sqrt(2) / 2)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
I am thinking that it would be B. However I am having trouble understanding how to get my answer.
anonymous
  • anonymous
\[x = rcos \theta\]\[y= rsin \theta\]
anonymous
  • anonymous
\[x = (-5)\cos(\frac{ \pi }{ 4 })\]\[y = (-5)\sin(\frac{ \pi }{ 4 })\]

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anonymous
  • anonymous
I don't get any of the answers :(
anonymous
  • anonymous
yes. last step is to use a unit circle to get sin (π/4) and cos (π/4)
anonymous
  • anonymous
45?
anonymous
  • anonymous
Oh sin and cos of 45?
anonymous
  • anonymous
yes
anonymous
  • anonymous
It would be A?
anonymous
  • anonymous
D. A doesn't have -5 for r
anonymous
  • anonymous
Oh you just said the answer didn't you
anonymous
  • anonymous
yes r can be negative. |dw:1435189073642:dw|
anonymous
  • anonymous
Oh I see now! D is the answer! Thank you for your time
anonymous
  • anonymous
no problem. you're welcome

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