straightedge (not a ruler, can't have markings) and compass. all of geo only these 2
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Line segments are congruent if they have the same length
In general, they are not congruent.
First, lines and rays cannot be congruent because they do not have both end points defined. Not having an end point define means we cannot talk about their length so they can't be congruent. Line segments, however, can be congruent. Congruent line segments NEED NOT be parallel.Furthermore, if two line segments are parallel, that does not mean they are congruent since parallel line segments may not have the same length.Congruent line segments would be ones that are the same length.
Two line segments of the same finite size.
Congruency means that two things are the same length. Therefore two line segments if the same length are congruent.