Definition:Cone/Double Napped Cone
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A double napped cone is a cone where the lines joining the apex to the circumference of the base extend indefinitely in either dimension:
Each of the halves of a double napped cone is a nappe.
Also known as
A double napped cone is also known as a double cone.
Some sources hyphenate: double-napped cone.
- Weisstein, Eric W. "Double Cone." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/DoubleCone.html