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Elliptical dome

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An elliptical dome, or an oval dome, is a dome whose bottom cross-section takes the form of an ellipse. Technically, an ellipsoidal dome has a circular cross-section, so is not quite the same.

An elliptical dome at the San Domenico, Modena, in Modena, Italy

Ellipse

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In mathematics, an ellipse is a plane curve surrounding two focal points, such that for all points on the curve, the sum of the two distances to the focal points is a constant. It generalizes a circle, which is the special type of ellipse in which the two focal points are the same. The elongation of an ellipse is measured by its eccentricity , a number ranging from to .

Wave pattern of a little droplet dropped into mercury in the foci of the ellipse

Image: Tilted Ellipse 2