If you add the lengths of the focal radii of an ellipse, what other value will you produce?

Answer: the length of the major axis
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If we add the lengths of focal radii of an ellipse the value of length of major axis will produce.
The major axis of an ellipse is the line segment connecting the two vertices.
Since, the sum of focal distances of a point on ellipse is constant.
And it is equals to the length of major axis.
Hence, if we add the lengths of focal radii of an ellipse the value of length of major axis will produce.
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