(x^2/a^2)+(y^2/b^2)+(z^2/c^2)-1 = 0
L’ellipsoide
(x^2/a^2)+(y^2/b^2)-(z^2/c^2)-1 = 0
l’hyperbole a une nappe
-(x^2/a^2)-(y^2/b^2)+(z^2/c^2)-1 = 0
l’hyperbole a deux nappes
(x^2/a^2)+(y^2/b^2) = z
parabole elliptique
(x^2/a^2)-(y^2/b^2) = z
paraboloide hyperbolique (selle de cheval)
(x^2/a^2)+(y^2/b^2)-(z^2/c^2) = 0
cone a base elliptique
(x^2/a^2)+(y^2/b^2) - 1 = 0
cylindre elliptique
(x^2/a^2)-(y^2/b^2) - 1 = 0
cylingre hyperbolique
x^2 = 2py
cylindre parabolique