Geometry proof - in advance for the !

Using reflexive property (for side), and the transversals of the parallel lines, we can prove the two triangles are congruent.

Step-by-step explanation:

Since AB and DC are parallel and AC is intersecting in the middle, you can make out two pairs of alternate interior angles. These angle pairs are congruent because of the alternate interior angles theorem. The two pairs of congruent angles are: ∠DAC ≅ ∠BCA, and ∠BAC ≅ ∠DCA. With the reflexive property, we know side AC ≅ AC. Using Angle-Side-Angle theorem, we can prove ΔABC ≅ ΔCDA.

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