Rectangular to Polar Coordinates
I have recangular coordinates at (1,1) and am to convert to Polar coordinates
My Problem: I thought that (1,1) was a point on the cartesian plane that described which quadrant the vector appeared in. Right 1, up 1 Quadrant-1 yes?
My book's answers show 2 solutions (which you can prove easily enough), but I though that knowing the coordinate made finding alternate solutions superfluous?
(1,1) to Polar
r= sqrt(2) and tanx = (pi/4) *since in QI, then tan=pi/4 is correct
Book ALSO shows
r=+-sqrt(2) and tanx=(pi/4) or (5pi/4)
(sqrt(2),(pi/4)) OR (-sqrt(2),(5pi/4))
If you calculate the polar coordinates back to rectangular for either answer you will indeed get (1,1) - But... why the extra work? Am I misinterpreting the implications of rectangular coordinates?
Thank you for your time