1. ## x^2+y^2-2y=0 ??

please can i know what is this equation x^2+y^2-2y=0
its not a circle nor a parabola

2. ## Re: x^2+y^2-2y=0 ??

Originally Posted by antar141993
please can i know what is this equation x^2+y^2-2y=0
its not a circle nor a parabola
$x^2+y^2-2y+1 = 1$

$x^2 + (y-1)^2 = 1$

yes, it's a circle centered at $(0,1)$

3. ## Re: x^2+y^2-2y=0 ??

thank you
i should've add a +1 and -1