Question

plz and this question.

Answer 1

In ∆ABC &∆CDA,
AC=AC (common)
angle DAC = angle ACB (AD & BC are ll and AC is transversal , so they are alternate interior angles)
angle BAC = angle ACD ( AB & DC are ll and AC is transversal , so they are alternate interior anlges)
therefore, ∆ ABC & ∆ CDA are congruent