anonymous
  • anonymous
Which set of polar coordinates describes the same location as the rectangular coordinates (1,-1)? A. (-1, 135 degrees) B. (sqrt(2) , 315 degrees) C. (1, 45 degrees) D. (sqrt(2) , 225 degrees) ***My Answer: A*** Is this correct?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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LynFran
  • LynFran
B
anonymous
  • anonymous
Why is that?
misssunshinexxoxo
  • misssunshinexxoxo
r is sqrt(2). positive r and -45 degrees or +315 degrees. use negative r and 135 degrees.

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misssunshinexxoxo
  • misssunshinexxoxo
B is initially correct:)
LynFran
  • LynFran
\[r ^{2}=x ^{2}+y ^{2}\] so, \[1^{^{2}}+(-1)^{2})=r ^{2}\]\[r=\sqrt{2}\]
anonymous
  • anonymous
Oh I see now! Thank you guys for the help : )
LynFran
  • LynFran
\[\tan^{-1} \frac{ -1 }{ 1 }=45\] subtract 45 from 360 u get 315
anonymous
  • anonymous
Ohhh that's what I was doing wrong. Thanks for helping me understand!

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