A straight line PQ touches the ellipse and the circle x2 + y2 = r2 (b < r < a). RS is a focal chord of the ellipse. If RSis parallel to PQ and meets the circle at points R and S. Find the length of RS.
RS = 2b
is a tangent to the ellipse this tangent also touches the circle x2 + y2 = r2.
The line RS passes through (ae, 0) and parallel to PQ is
Let T be the feet of the perpendicular dropped from the origin onRS
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