# Ellipses and Parabolas: Eccentricity

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Suppose we have an ellipse with a horizontal major axis and it has a fixed directrix of and corresponding focus at . Depending on the eccentricity, we will end up with a different ellipse. Adjust the slider for the eccentricity and see what happens to the ellipse. Answer the questions below.
*Note: You can zoom in and out by scrolling on the mouse.*

As , what happens to the ellipse?

Where does the other focus go? And the center of the ellipse?

What happens as you decrease ?