In geometry, two or more lines are said to be concurrent if they intersect at a single point.
If they do not intersect at the single point they are non concurrent.
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concurrent
things that do not run back to back
Intersecting. Usually, if there are three or more lines, they are said to be concurrent.Intersecting. Usually, if there are three or more lines, they are said to be concurrent.Intersecting. Usually, if there are three or more lines, they are said to be concurrent.Intersecting. Usually, if there are three or more lines, they are said to be concurrent.
In classical or Euclidean plane geometry two points defines exactly one line. On a sphere two points can define infinitely many lines only one of which will represent the shortest distance between the points. On other curved surfaces, or in non-Euclidean geometries, the number of lines determined by two points can vary. Even in the Euclidean plane, two points determine infinitely many lines that are not straight!
No, non-coplanar lines are not skew. Skew lines are non-coplanar lines that do not intersect and are not parallel. Non-coplanar lines are simply lines that do not lie in the same plane. Skew lines, on the other hand, are non-coplanar and not parallel, making them a specific subset of non-coplanar lines.