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horizontal ellipse
(x - h)2 + (y - k)2 = 1
a2 b2
vertical ellipse
(x - h)2 + (y - k)2 = 1
b2 a2
horizontal hyperbola
(x - h)2 - (y - k)2
a2 b2
vertical hyperbola
(x - h)2 - (y - k)2
b2 a2
vertical AOS parabola
(x - h)2 = 4p(y - k)
horizontal AOS parabola
(y - k)2 = 4p(x - h)
circle
(x - h)2 + (y - k)2 = r2
AC for circle
A = C
AC for ellipse
same sign
AC for parabola
A = 0 or C = 0
AC for hyperbola
opposite signs