For the plane $z=50$ on the surface $z=75-x^2-y^2$, the contour lines is the circle $x^2+y^2=25$ in the xy-plane.
My question is why we say "contour lines" not "contour curve", also we use "lines" not "line" ?
2026-05-05 20:32:38.1778013158
Contour lines or Contour curve?
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