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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. [10]

  3. List of most-viewed YouTube videos - Wikipedia

    en.wikipedia.org/wiki/List_of_most-viewed...

    Specifically, to count as a legitimate view, a user must intentionally initiate the playback of the video and play at least 30 seconds of the video (or the entire video for shorter videos). Additionally, while replays count as views, there is a limit of 4 or 5 views per IP address during a 24-hour period, after which point, no further views ...

  4. Conic section - Wikipedia

    en.wikipedia.org/wiki/Conic_section

    The three types of conic section are the hyperbola, the parabola, and the ellipse; the circle is a special case of the ellipse, though it was sometimes considered a fourth type. The ancient Greek mathematicians studied conic sections, culminating around 200 BC with Apollonius of Perga 's systematic work on their properties.

  5. YouTube VR - Wikipedia

    en.wikipedia.org/wiki/YouTube_VR

    YouTube VR allows for access to all YouTube-hosted videos, but particularly supports headset access for 360° and 180°-degree video (both in 2D and stereoscopic 3D). The interface shows videos behind two floating panels, with the video description and comments showing on the left panel and related videos or playlists showing on the right panel.

  6. Cross section (geometry) - Wikipedia

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

    If a cylinder is used in this sense, the above paragraph would read as follows: A plane section of a right circular cylinder of finite length [6] is a circle if the cutting plane is perpendicular to the cylinder's axis of symmetry, or an ellipse if it is neither parallel nor perpendicular to that axis. If the cutting plane is parallel to the ...

  7. Best hearing aids for seniors in 2025, according to experts ...

    www.aol.com/lifestyle/hearing-aids-for-seniors...

    The app also allows you to connect easily to Lexie experts who can offer support via video, chat or phone. While some OTC hearing aid brands give you a set time for free support, Lexie offers ...

  8. Elliptical polarization - Wikipedia

    en.wikipedia.org/wiki/Elliptical_polarization

    When increases from zero, i.e., assumes positive values, the line evolves into an ellipse that is being traced out in the counterclockwise direction (looking in the direction of the propagating wave); this then corresponds to left-handed elliptical polarization; the semi-major axis is now oriented at an angle .

  9. Seniors dance back to normal in New York - AOL

    www.aol.com/news/seniors-dance-back-normal-york...

    STORY: Despite stiff joints - or even the loss of a limb - the students stick it out in the free class taught by Walter Perez at the YM & YWHA of Washington Heights and Inwood in upper Manhattan ...