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A curve defined by an equation x^2/a^2 + y^2/b^2 = 1 is known as ________

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A curve defined by an equation   x^2/a^2 + y^2/b^2 = 1 is known as ________

(a) Ellipse

(b) Directrix

(c) Parabola

(d) Hyperbola

I got this question during an interview for a job.

Enquiry is from Curves Used in Engineering Practice in chapter Lettering Practice, Scales & Curves of Civil Engineering Drawing

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Best answer
The correct choice is (a) Ellipse

To explain: A plane curve such that the sums of the distances of each point in its periphery from two fixed points, the foci, are equal. It is a conic section formed by the intersection of a right circular cone by a plane that cuts the axis and the surface of the cone.

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