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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
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
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