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(x - h)² + (y - k)² = r²
Standard Form of a Circle
x² + y² + Dx + Ey + F = 0
General Form of a Circle
Circle
Plane passes through one nap, perpendicular to the axis
Ellipse
Passes through one nap at an angle
Parabola
Passes through one nap, angled to the generator
Hyperbola
Passes through both naps
Non-Degenerate Conics
Circle,Ellipse,Parabola,Hyperbola
Degenerate Conics
cases where the intersecting plane passes through the vertex of the cone
D²/4 + E²/4 - F = R²
Formula to get the Radius²
Distance Formula
√(x₂-x₁)² + (y₂-y₁)²
Circle
R > 0
Point Circle
R = 0
No graph
R < 0