Question

question 9 of 10
if you add the lengths of the focal radii of an ellipse, what other value will you produce?
a. 2a
b. 2c
c. 2b
d. the eccentricity

Explanation:

By the definition of an ellipse, the sum of the lengths of the focal radii (the distances from any point on the ellipse to the two foci) is equal to the length of the major - axis. The length of the major - axis of an ellipse is \(2a\), where \(a\) is the semi - major axis length.

Answer:

A. \(2a\)