Difference between revisions of "Ray"
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Marcdaniels (talk | contribs) (not correct - it is trite math that some infinities are greater than others) |
(Undo revision 534191 by Marcdaniels (Talk) the text does not assert one infinity is bigger than the other) |
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| − | A '''ray''' is a portion of a [[line]] which starts at a given [[point]] and continues endlessly in one direction. Intuitively, it can be thought of as "half" a line because it extends [[infinite]]ly in only one direction rather than two, opposite directions as lines do. | + | A '''ray''' is a portion of a [[line]] which starts at a given [[point]] and continues endlessly in one direction. Intuitively, it can be thought of as "half" a line because it extends [[infinite]]ly in only one direction rather than two, opposite directions as lines do. Of course, quantitatively, "half a line" is somewhat meaningless since a line is infinite and half of infinity is still infinity. |
[[Category:Geometry]] | [[Category:Geometry]] | ||
Revision as of 17:44, October 18, 2008
A ray is a portion of a line which starts at a given point and continues endlessly in one direction. Intuitively, it can be thought of as "half" a line because it extends infinitely in only one direction rather than two, opposite directions as lines do. Of course, quantitatively, "half a line" is somewhat meaningless since a line is infinite and half of infinity is still infinity.