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z = Ax² + By²
Elliptic paraboloid


Level curves for elliptic paraboloid


Vertical section for elliptic paraboloid

z = Ax² + By² except A and B have opposite signs (so more like Ax² - By²
Hyperbolic paraboloid


Level curves for hyperbolic paraboloid


Vertical sections for hyperbolic paraboloid

x²/A² + y²/B² + z²/C² = 1
Ellipsoid


Ellipsoid level curves


Ellipsoid vertical sections

z² = Ax² + By²
Double cone


Double cone level curve


Double cone vertical sections

x²/A² + y²/B² - z²/C² = 1
Hyperboloid if one sheet


Hyperboloid of one sheet level curves
Imagine it when setting one variable = 0


Hyperboloid of one sheet vertical sections

-x²/A² - y²/B² + z²/C² = 1
Hyperboloid of two sheets


Hyperboloid of two sheets level curves
Imagine them when setting one variable = 0


Hyperboloid of two sheets vertical sections
