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Which of the following has an eccentricity less than one?

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Which of the following has an eccentricity less than one?

(a) Circle

(b) Parabola

(c) Hyperbola

(d) Ellipse

This question was posed to me in examination.

Asked question is from Basics of Conic Sections topic in portion Curves used in Engineering Practice of Engineering Drawing

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The correct option is (d) Ellipse

To explain: Eccentricity is defined as the ratio of the distance from the focus to the distance from the directrix. It is denoted as e. The value of eccentricity can give information regarding which type of conics it is. The eccentricity of an ellipse is less than one.

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