AB=CD
given
AB=CD
definition of
congruent segments
AE+EB = CF + FD
segment addition
AE=FD
AE FD
definition of
congruent segments
AB=AE+EB
CD= CF+FD
segment addition
CF= EB
given
CF = EB
definition of
congruent segments

ABCD given ABCD definition of congruent segments AEEB CF FD segment addition AEFD AE FD definition of congruent segments ABAEEB CD CFFD segment addition CF EB g class=