Two line segments are parallel if the distance between them is the same from one end of the line segment to the other, or if they never intersect. They may very well be different lengths which would give them different midpoints. In fact if you plotted them on the x,y, cartesian coordinate system, even if they were the same lenght, the midpoint would be different since the lines never intersect.
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lines
Line segments are congruent if they have the same length.
If two line segments are congruent then they have the same length.
congruent
The same. Parallel lines have the same slope.