z=Ax²+By²
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Elliptic Paraboloid
z=Ax²-By²
Hyperbolic Paraboloid
Ax²+By²+Cz²=1
Ellipsoid
Ax²+By²=Cz²
Elliptical Cone
Ax²+By²-Cz²=1
Hyperboloid of One Sheet
Cz²-Ax²-By²=1
Hyperboloid of Two Sheets