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HYPERBOLA |
Conic section |
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CONIC |
A conic section. |
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CONOID |
A solid formed by the revolution of a conic section about
its axis; as, a parabolic conoid, elliptic conoid, etc.; -- more
commonly called paraboloid, ellipsoid, etc. |
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LATUS RECTUM |
The line drawn through a focus of a conic section
parallel to the directrix and terminated both ways by the curve. It is
the parameter of the principal axis. See Focus, and Parameter. |
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DIRECTRIX |
A straight line so situated with respect to a conic
section that the distance of any point of the curve from it has a
constant ratio to the distance of the same point from the focus. |
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DIAMETER |
Any right line passing through the center of a figure or
body, as a circle, conic section, sphere, cube, etc., and terminated by
the opposite b... |
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FOCUS |
A point so related to a conic section and certain straight
line called the directrix that the ratio of the distace between any
point of the cur... |
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ELLIPSE |
An oval or oblong figure, bounded by a regular curve,
which corresponds to an oblique projection of a circle, or an oblique
section of a cone t... |
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INDICATRIX |
A certain conic section supposed to be drawn in the
tangent plane to any surface, and used to determine the accidents of
curvature of the surfa... |
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POLAR |
...ntact of
the two tangents drawn from a given point to a given conic section. The
given point is called the pole of the line. If the given point ... |