one a number line,the coordinates of A,B,C,and D are -5,-1,3,and 7 respectively. Find the length of the two segments and tell whether they are congruent AB and CD ,CA and DB,and BC and AD?
well, since AB = B-A = -1 - (-5) = 4
and CD = D-C = 7-3 = 4,
AB & CD are congruent.
Seeing how that's done, you can prolly handle the other ones...