When applied to two line segments, they are said to be congruent if they are both exactly the same length, but they need not be parallel to each other (they can also bisect each other).
Thickness does not matter as lines have no thickness (thickness only applies to shapes).
However, it should be noted that rays and lines are not congruent as their lengths are infinite. Rays have no defined end point while lines have neither a start nor an end point defined. Line segments always have both a start and an end point defined.
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If two line segments are congruent then they have the same length.
Congruent
They must be the same length.
Congruent.
The length of segment AB (A(2,6), B(0,3)) and CD (C(-1,0), D(1,3)) is the square-root of 13. The two segments are congruent.