Question

if u know the answer please tell]
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Answer 1

Answer:

a yes by sss rule

b ad=AD

ab=ac

bd=cD

Answer 2

Answer:

4(1) yes ∆ADB=∆ADC by side angle side congruence condition(SAS)

4(2) the three pair of matching parts are side BA=side AC, side BD= side DC, angle ADB= angle ADC