[Cinderella]构造锥线5L,4L1P,1P4L,5P

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Cinderella的Conic mode menu包括
by 5 Points
by 4 Points 1 Line
by 1 Point 4 Lines
by 5 Lines
Parabola by Point and Line
Ellipse by Foci and Point
Hyperbola by Foci and Point
inscribed in 4-Gon (4P)
by Center and Principle Axis Points (3P)

4点1切线构造锥线