Talk:transversal

...but a line can never intersect the three sides of a triangle at the same time... what does it mean?

Yes it can, if it is colinear with one side. But the definition can certainly use improvement. You can improve it yourself ... Robert Ullmann 14:35, 11 October 2007 (UTC)
 * Actually, it can't...If it was colinear with one side, it couldn't intersect the other two. The other two would just be tangent to it.