Answer:
Refer to the attachment for the labelling of the triangles.
In △ABD & △ACD,
AD = AD (common side)
∠A = ∠A (common angle)
AB = AC (equal pair of sides)
•°• △ABD ≅ △ACD (Single-Angle-Side congruence rule → SAS congruence rule)
Hope it helps ⚜
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