**Double Cone**

A geometric figure made up of two right circular cones placed apex to apex as shown below. Typically a double cone is considered to extend infinitely far in both directions, especially when working with conic sections and degenerate conic sections.

Note: The graph of the equation*z*^{2} = *x*^{2} + *y*^{2} is a standard way to represent a double cone. That is the equation for the image below.

Double Cone

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