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Converting from square to polar coordinants

  • Thread starter Bob19
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  • #1
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Hi

If I have the following equation:

x^2 - 2y = 0

I need to convert it into polar coordinants:

r^2 * cos(phi)^2 - 2*r* sin(phi) = 0

Is this correct ?

/Bob
 

Answers and Replies

  • #2
arildno
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Yes, it is correct.
 
  • #3
HallsofIvy
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Bob19 said:
Hi

If I have the following equation:

x^2 - 2y = 0

I need to convert it into polar coordinants:

r^2 * cos(phi)^2 - 2*r* sin(phi) = 0

Is this correct ?

/Bob
And, of course, as long as r is not 0, you can divide through by r to get
[tex]r cos^2(\theta)- 2sin(\theta)= 0[/tex]
or
[tex]r= \frac{2sin(\theta)}{cos^2(\theta)}[/tex]

(It is customary to use "theta" in polar coordinates rather than "phi")
 

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