I like this article, but I think the geogebra applets are currently a bit buggy. In the first one, changing the r slider seems to change the real component of the blue point rather than its radius (if I set r=0 and theta=0.4 then I get a point on the imaginary axis, rather than the origin). In the second one, changing the r slider seems to have no effect on the red point.

I like this article, but I think the geogebra applets are currently a bit buggy. In the first one, changing the r slider seems to change the real component of the blue point rather than its radius (if I set r=0 and theta=0.4 then I get a point on the imaginary axis, rather than the origin). In the second one, changing the r slider seems to have no effect on the red point.