3d plot -> 2d cirlce -> specific degree / tilt / slope

Hello, here is a code of creating a 2d circle in a 3d plot using liear algebra,

r=1;

theta=-pi:0.01:pi;

x=r*cos(theta);

y=r*sin(theta);

plot(x,y,zeroes(1,numel(x)));

how can i give the circle an specific degree / give it some tilt.

[Image Analyst]

You probably should have kept this discussion in your original thread this one, where I asked you questions about what slope meant, rather than starting up another one.