Respuesta :

AD = BC ----> Parallel lines
AC = AC -----> Reflexive property
<A = <C -----> Congruent angles
<D = <B -----> Congruent angles
Ac congruent to ac by reflexive property
Triangle acd is congruent to triangle cab by side, side, side
Angle d is congruent to angle b by cpctc (corresponding parts of congruent triangles are congruent) hope this helpef

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