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  2. Lambert conformal conic projection - Wikipedia

    en.wikipedia.org/wiki/Lambert_conformal_conic...

    The cone is unrolled, and the parallel that was touching the sphere is assigned unit scale. That parallel is called the standard parallel . By scaling the resulting map, two parallels can be assigned unit scale , with scale decreasing between the two parallels and increasing outside them.

  3. Gurney equations - Wikipedia

    en.wikipedia.org/wiki/Gurney_equations

    Effective charge mass for thin charges - a 60° cone. The basic Gurney equations for flat sheets assume that the sheet of material is a large diameter. Small explosive charges, where the explosive's diameter is not significantly larger than its thickness, have reduced effectiveness as gas and energy are lost to the sides. [1]

  4. Spherical conic - Wikipedia

    en.wikipedia.org/wiki/Spherical_conic

    In mathematics, a spherical conic or sphero-conic is a curve on the sphere, the intersection of the sphere with a concentric elliptic cone. It is the spherical analog of a conic section ( ellipse , parabola , or hyperbola ) in the plane, and as in the planar case, a spherical conic can be defined as the locus of points the sum or difference of ...

  5. Conical spiral - Wikipedia

    en.wikipedia.org/wiki/Conical_spiral

    Conical spiral with an archimedean spiral as floor projection Floor projection: Fermat's spiral Floor projection: logarithmic spiral Floor projection: hyperbolic spiral. In mathematics, a conical spiral, also known as a conical helix, [1] is a space curve on a right circular cone, whose floor projection is a plane spiral.

  6. Conic section - Wikipedia

    en.wikipedia.org/wiki/Conic_section

    A conic is the curve obtained as the intersection of a plane, called the cutting plane, with the surface of a double cone (a cone with two nappes).It is usually assumed that the cone is a right circular cone for the purpose of easy description, but this is not required; any double cone with some circular cross-section will suffice.

  7. Cone - Wikipedia

    en.wikipedia.org/wiki/Cone

    A cone is a three-dimensional geometric shape that tapers smoothly from a flat base (frequently, though not necessarily, circular) to a point called the apex or vertex. A cone is formed by a set of line segments, half-lines, or lines connecting a common point, the apex, to all of the points on a base that is in a plane that

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  9. Cone (topology) - Wikipedia

    en.wikipedia.org/wiki/Cone_(topology)

    The cone over a closed interval I of the real line is a filled-in triangle (with one of the edges being I), otherwise known as a 2-simplex (see the final example). The cone over a polygon P is a pyramid with base P. The cone over a disk is the solid cone of classical geometry (hence the concept's name). The cone over a circle given by