Final answer:
The eccentricity of an ellipse measures how stretched out it is from a perfect circle, with values ranging between 0 and 1. It is calculated by dividing the distance from the center to one of the foci by half the long axis.
Explanation:
The eccentricity of an ellipse is a measure of how stretched out the ellipse is from a perfect circle. It is calculated by dividing the distance from the center of the ellipse to one of the foci by half the long axis. The eccentricity falls between 0 and 1, with 0 indicating a circle and values closer to 1 indicating shapes approaching a parabola.
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