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An ellipse has ____ foci.

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An ellipse has ____ foci.

(a) 1

(b) 2

(c) 3

(d) 4

This question was posed to me in an online interview.

My question comes from Construction of Ellipse topic in portion Geometrical Construction of Engineering Drawing

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The correct option is (b) 2

For explanation: An ellipse has 2 foci. These foci are fixed in a plane. The sum of the distances of a point with the foci is always same. The ellipse can also be defined as the curved traced by the points which exhibit this property.

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