Answer :

brittanycandace
You can know if they are congruent by the length of both lines! 
Ryan2
You must calculate the length of the segments.

Suppose segments AB and CD
Being A (m, n), B (p, q)  C(r,s) and D(t,u)

They are congruent if:

[tex]\boxed{(p-m)^2+(q-n)^2=(t-r)^2+(u-s)^2}[/tex]

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