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I am really desparately trying to find the lenght of the "radius" of an ellipse.I will explain exactly what I mean by that - its the lenght of the line segment that connects the center of a particular ellipse with a given point of the same ellipse.All the information I have to solve this problem is the ellipse equation and an angle measured from the major axis to that line segment,the center of the ellipse and cartesian coordinate system .

All kinds of tips and hints will be greatly appreciated.