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$Old$ 09-01-2008, 04:55 AM

roshanhero $roshanhero is offline$

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What is meant by director circle and what is the general diagram of it?

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#2

$Old$ 09-01-2008, 07:57 AM

TKHunny $TKHunny is offline$

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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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ellipse circle geometry

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