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Ak d
je rôzny od 0, kužeľosečka je regulárna. Ak:
AC - B2 > 0
a Ad
> 0 ......................................................................Prázdna
množina.
AC - B2 > 0
a Ad
< 0 ......................................................................Elipsa.
AC - B2 > 0
, Ad
< 0 a
A=B ..........................................................Kružnica.
AC - B2 = 0
........................................................................................Parabola.
AC - B2 <
0 ........................................................................................Hyperbola.