Dandelin spheres

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Notion

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Science and technology

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What Wikipedia says

In geometry, the Dandelin spheres are one or two spheres that are tangent both to a plane and to a cone that intersects the plane.

Excerpt from the Wikipedia article “Dandelin spheres”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Cmapm, CC BY-SA 3.0, via Wikimedia Commons.