Kvadrike

Nedegenerirane kvadrike (plohe drugog reda):
Elipsoid	${x^{2} \over a^{2}}+{y^{2} \over b^{2}}+{z^{2} \over c^{2}}=1\,$
Sferoid (specijalan slučaj elipsoida)	${x^{2} \over a^{2}}+{y^{2} \over a^{2}}+{z^{2} \over b^{2}}=1\,$
Kugla (specijalan slučaj sferoida)	${x^{2} \over a^{2}}+{y^{2} \over a^{2}}+{z^{2} \over a^{2}}=1\,$
Eliptični paraboloid	${x^{2} \over a^{2}}+{y^{2} \over b^{2}}-z=0\,$
Kružni paraboloid (specijalan slučaj eliptičnog paraboloida)	${x^{2} \over a^{2}}+{y^{2} \over a^{2}}-z=0\,$
Hiperbolični paraboloid	${x^{2} \over a^{2}}-{y^{2} \over b^{2}}-z=0\,$
Spojeni hiperboloid	${x^{2} \over a^{2}}+{y^{2} \over b^{2}}-{z^{2} \over c^{2}}=1\,$
Odvojeni hiperboloid	${x^{2} \over a^{2}}+{y^{2} \over b^{2}}-{z^{2} \over c^{2}}=-1\,$
Degenerirane kvadrike
Konus	${x^{2} \over a^{2}}+{y^{2} \over b^{2}}-{z^{2} \over c^{2}}=0\,$
Kružni konus (specijalan slučaj konusa)	${x^{2} \over a^{2}}+{y^{2} \over a^{2}}-{z^{2} \over c^{2}}=0\,$
Eliptični cilindar	${x^{2} \over a^{2}}+{y^{2} \over b^{2}}=1\,$
Kružni cilindar (specijalan slučaj eliptičnog cilindra)	${x^{2} \over a^{2}}+{y^{2} \over a^{2}}=1\,$
Hiperbolični cilindar	${x^{2} \over a^{2}}-{y^{2} \over b^{2}}=1\,$
Parabolični cilindar	$x^{2}+2ay=0\,$

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Kvadrike

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