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our segment line segment a-b and line segment CD congruent so let's look at these right over your a B is this line segment right over here and CD is this one right over here a B has length of one it goes from two to three and CD has length of one it goes from four to five so they have the exact same length these are just line segments with the exact same length so yes they are congruent yes let's do a couple more our a B and C D congruent so a B and you can just eyeball this a B is much longer than CDA B is of length four goes from negative 5 to negative 1 CD is only of length 1 it goes from 1 to 2 so no they are not congruent they have different lengths let's do one more our a b and c d congruent let's the a b as length 2 it goes from negative 1 to 1 CD is of length 3 so they're not congruent no