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ellipse angle

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I have got an ellipse centred on the origin - and a vector coming from the centre, how can I find the point on the perimeter of the ellipse at which the two will intersect( in other word the length of vector) and the angle which the line makes with the positive x-axis? in the below post there is an answer for the length of the vector which have an intersection with the ellipse but I need the angle as well. only known parameters in my case are semi major axis and semi minor exis of ellipse. http://www.gamedev.net/community/forums/topic.asp?topic_id=481256&whichpage=1�

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