Ellipses

Deutsch: Ellipsen sind mathematische Objekte

English: Ellipses are mathematical objects

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  Blue ellipse
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  A circle
  and a red ellipse

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  Ellipse formed out of a conic section
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  (grüne) Ellipse im Kegelschnitt

  English: (Green) ellipse and cone
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  different types of ellipses, animation and description
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  Parametric ellipse (in red)
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  Archimedes Trammel - ellipsograph for drawing
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  Bullshit grinder - ellipsograph for construction
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  Ellipse construction
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  Proof of a property of ellipse tangents
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  Basic form of a ellipse, media file