CO-Ci2 CO-Orthoptic Circle

An orthoptic is the locus of points for which two tangents of a given curve meet at a right angle.

CO-Ci2 is the orthoptic of the reference conic.

The orthoptic of an ellipse x²/a² + y²/b² = 1, is the director circle x² + y² = a² + b².

The orthoptic of a hyperbola x²/a² − y²/b² = 1, a > b, is the circle x² + y² = a² − b².

The orthoptic of a parabola is its directrix.

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