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If the distance from a fixed straight line is equal to the distance from a fixed point then what is the name of the conic section?

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If the distance from a fixed straight line is equal to the distance from a fixed point then what is the name of the conic section?

(a) Ellipse

(b) Parabola

(c) Hyperbola

(d) Circle

This question was addressed to me during an interview.

Query is from Basics of Conic Sections topic in section Curves used in Engineering Practice of Engineering Drawing

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Right option is (b) Parabola

Easy explanation: The fixed straight line is called as directrix and the fixed point is called as a focus. Eccentricity is defined as the ratio of the distance from the focus to the distance from the directrix and it is denoted by e. Eccentricity of a parabola is unity.

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