They are also members of the Directors Circle for the Alvin Ailey American Dance Theater.
2.
The director circle of a hyperbola has radius } }, and so, may not exist in the Euclidean plane, but could be a circle with imaginary radius in the complex plane.
3.
The director circle of an ellipse is a special case of this more general construction with two points " P " 1 and " P " 2 at the foci of the ellipse, weights " w " 1 = " w " 2 = 1, and " C " equal to the square of the major axis of the ellipse.
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