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Which of the following has an eccentricity more than unity?

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Which of the following has an eccentricity more than unity?

(a) Parabola

(b) Circle

(c) Hyperbola

(d) Ellipse

The question was posed to me in an online interview.

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

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Right choice is (c) Hyperbola

Explanation: 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 a hyperbola is more than one.

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