r = cos(theta) in polar coordinates?? Hullo everyone! Hows it going? I am confused with how to interpret the graph of r = cos(theta) in polar coordinates. I tried graphing it manually. and this is how I interpreted it: r(0) = cos(0) = 1 r(pi/2) = 0 r(-pi) = -1 r(3pi/2) = 0 r(2pi) = 1 This gives me three points in a line @.@ with one on the negative x axis, one on the origin, and one on the positive x axis. But apparently, its supposed to be a circle; how so? Could someone please explain where I am going wrong? Thanks v. much!