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Geometric shape that tapers smoothly from a circular base to a point S called vertex, this shape is also called Cone, vintage line drawing or engraving illustration.
Structure of s orbital or spherical
The three shapes of conic section are shown the hyperbola, the parabola, and the ellipse, vintage line drawing or engraving illustration.
Parabola, vintage engraved illustration. Trousset encyclopedia (1886 - 1891).