Thread: Cartesian to Polar

x^2 + y^2 = 9

Can I just say that r^2 = 9, r = 3. Is this the polar equation? Seems a bit easy.

Cheers.

Originally Posted by Sprintz

x^2 + y^2 = 9

Can I just say that r^2 = 9, r = 3. Is this the polar equation? Seems a bit easy.

Cheers.

Yes, it's that easy.

Ah, thanks. How about this one:

x + y = 9.

Should I state (t = theta):

rcost + rsint = 9
r = 9/(cost + sint)

Or is there a better way to express this? Thanks.

Originally Posted by Sprintz

Ah, thanks. How about this one:

x + y = 9.

Should I state (t = theta):

rcost + rsint = 9
r = 9/(cost + sint)

Or is there a better way to express this? Thanks.

That's the answer.