1. The problem statement, all variables and given/known data intersection [tex]x^2+y^2+z^2=4[/tex] and plane [tex]y=z[/tex] 2. Relevant equations n/a 3. The attempt at a solution so, i solve it simultaneously, and get the equation of ellipse [tex]x^2+2y^2=4[/tex]. but what does the ellipse tell me? is that the points of the intersection?, but aren't it should be a circle?