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2. Perimeter of an ellipse - Wikipedia

   en.wikipedia.org/wiki/Perimeter_of_an_ellipse

   In more recent years, computer programs have been used to find and calculate more precise approximations of the perimeter of an ellipse. In an online video about the perimeter of an ellipse, recreational mathematician and YouTuber Matt Parker, using a computer program, calculated numerous approximations for the perimeter of an ellipse. [4]

3. Ellipse - Wikipedia

   en.wikipedia.org/wiki/Ellipse

   An ellipse (red) obtained as the intersection of a cone with an inclined plane. Ellipse: notations Ellipses: examples with increasing eccentricity. 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.

4. Flattening - Wikipedia

   en.wikipedia.org/wiki/Flattening

   Flattening is a measure of the compression of a circle or sphere along a diameter to form an ellipse or an ellipsoid of revolution respectively. Other terms used are ellipticity , or oblateness . The usual notation for flattening is f {\displaystyle f} and its definition in terms of the semi-axes a {\displaystyle a} and b {\displaystyle b} of ...

5. Semi-major and semi-minor axes - Wikipedia

   en.wikipedia.org/wiki/Semi-major_and_semi-minor_axes

   The semi-minor axis of an ellipse runs from the center of the ellipse (a point halfway between and on the line running between the foci) to the edge of the ellipse. The semi-minor axis is half of the minor axis. The minor axis is the longest line segment perpendicular to the major axis that connects two points on the ellipse's edge.

6. Nearly 30% of US drugstores closed in one decade, study shows

   www.aol.com/nearly-30-us-drugstores-closed...

   Black and Latino neighborhoods were most vulnerable to the retail pharmacy closures, which can chip away at already-limited care options in those communities, researchers said in a study published ...

7. Focus (geometry) - Wikipedia

   en.wikipedia.org/wiki/Focus_(geometry)

   The ellipse thus generated has its second focus at the center of the directrix circle, and the ellipse lies entirely within the circle. For the parabola, the center of the directrix moves to the point at infinity (see Projective geometry). The directrix "circle" becomes a curve with zero curvature, indistinguishable from a straight line.