Answer :

Taking ΔABC and ΔABD in consideration-

AD = BC


Since, it is given that


1 = 2 and 3 = 4


Adding them –


1 + 3 = 2 + 4.


= DAB = ABC


And AB is the common side on both triangle.


So, by side angle side(SAS) criteria-


Triangle ΔABC and ΔABD are congruent.


So, BD = AC (by congruency criteria).


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