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Instructions.
Use the buttons to slice the surface
\(\frac{x^2}{4} + \frac{y^2}{9} + \frac{z^2}{16} = 1\) with planes
\(x=c\text{,}\) \(y=c\text{,}\) or
\(z=c\text{,}\) and drag the slider to vary
\(c\text{.}\) The equation of each cross-section is displayed above the figure. Drag the figure to view it from a different angle, or press the “Rotate” button to spin it automatically.