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What is the sum of focal radii of any point on an ellipse equal to ?

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What is the sum of focal radii of any point on an ellipse equal to ?
A. Length of latusrectum
B. Length of major-axis
C. Length of minor-axis
D. Length of semi-latusretum
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Correct Answer - B
We know sum of the focal distances of a point on the ellipse is constant and is equal to the length of the major axis.
Thus, we know that, the sum of focal fradii of any point on ellipse is equal to length fo major axis.
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