How would I prove the congruency of these triangles?

Answer:
SAS
Step-by-step explanation:
line AB = line CD S = SIDE
AB = CD because the shape is a parallelogram and opposite sides of a parallelogram are equal.
Hence, proved AB = CD
Answer:
Step-by-step explanation:
In ΔADC & ΔABC,
Statement Reason
AD = BC Given
∠DAC ≅ ∠ACB {AB // BC , AC is transversal, ⇒ alternate interior angles are equal}
AC = CA Reflexive property
ΔADC ≅ ΔABC SAS congruent
AB = CD CPCT -> Corresponding Part of Congruent Triangles