What is the definition of an ellipse

The video tutorial reviews the definition of a parabola, focusing on the concepts of focus and directrix, and explains that any point on a parabola is equidistant from the focus and directrix. It then introduces ellipses, describing them as distorted circles or two parabolas focusing on each other. The key property of an ellipse is that the sum of the distances from any point on the ellipse to the two foci is constant. This property is explained with examples, emphasizing the difference from parabolas.

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