Question: How to get a 2D circle in a 3D plot?

A circle in XOY plane in a 3D axis system
There are two commands :
- spacecurve ( calculus)
- SpaceCurve ( vectorcalculus) 

p1 := plots:-spacecurve([x, sqrt(-x^2 + 1), 0], x = -1 .. 1, color = black, thickness = 5);
p2 := plots:-spacecurve([x, -sqrt(-x^2 + 1), 0], x = -1 .. 1, color = black, thickness = 5);
plots:-display(p1, p2, scaling = constrained, labels = [x, y, z]);

spacecurve plot for circle in parametric form sin(t,cos(t) ?
Spacecurve plot for circle  ( coordinatesystem )? 


 

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