They are two lines that are on top of each other, so they are the same line.
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Circles that have congruent radii. Congruent=coinciding at all points when superimposed (http://dictionary.reference.com/browse/congruent)
Different types of lines are :parallel lines, intersecting lines, perpendicular lines,oblique lines, vertical lines, horizontal lines, zigzag lines, curved lines ,wavy lines, and dashed or dotted lines.
Either parallel lines or longitudinal lines are opposite transversal lines.
40 lines.40 lines.40 lines.40 lines.
No. Skew lines are lines in different planes that are parallel.