History of Cone

	Revision 2 . . March 22, 2001 9:43 am by Lee Daniel Crocker
	Revision 1 . . March 22, 2001 9:31 am by AstroNomer [Mathematicians, check this and conic sections.]

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Difference (from prior major revision) (no other diffs)

Changed: 1,2c1

Surface generated when a rect? is rotated around a fixed point, at a fixed angle from another rect, the axis, that passes through that point.

In mathematical terms, a cone is the surface generated when a line? is rotated around a fixed point, at a fixed angle from another line (called the axis), both lines passing through that fixed point. It also can be said that it is the locus of all the points belonging to all the lines that pass through a given point, and that intersect at that point at a fixed angle to the axis line.

Changed: 4,6c3

It also can be said the it is the [geometric place]? of all the points belonging to all the rects that pass through a given point, and intersect at that point at the same angle another rect, called the axis.

The shape called "cone" in more colloquial usage is half of a mathematical cone, being divided at the fixed point.