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The curve which has eccentricity zero is _______

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The curve which has eccentricity zero is _______

(a) Parabola

(b) Ellipse

(c) Hyperbola

(d) Circle

This question was posed to me in a job interview.

The doubt is from Basics of Conic Sections in division Curves used in Engineering Practice of Engineering Drawing

1 Answer

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Best answer
Correct answer is (d) Circle

To elaborate: The eccentricity is the ratio of a distance from a point on the curve to focus and to distance from the point to directrix. For parabola it is 1 and for ellipse it is less than 1 and for hyperbola it is greater than 1. And for circle it is zero.

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