Solution: What is the equation of the directrix of an ellipse?

(Last Updated On: December 8, 2017)

What is the equation of the directrix of an ellipse?

Problem Statement:

An ellipse with center at the origin has a length of major axis 20 units. If the distance from center of ellipse to its focus is 5, what is the equation of its directrix?

Problem Answer:

The equation of the directrix of the ellipse is x = ±20.

Solution:

Latest Problem Solving in Analytic Geometry Problems (Circles, Parabola, Ellipse, Hyperbola)

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Solution: What is the equation of the directrix of an ellipse?
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