# In the given figu

Taking ΔABC and ΔABD in consideration-

Since, it is given that

1 = 2 and 3 = 4

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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