What is meant by director circle and what is the general diagram of it?
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Find a pair of perpendicular tangents. Find the point of intersection of the tangents. The point of intersection will be on the "Director Circle" If you ellispse is x^2 / a^2 + y^2 / b^2 = 1, then your director circle is x^2 + y^2 = a^2 + b^2
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