Question

Help me please

Answer 1

you can see that they have in common:

~ the side \(\large\color{black}{ {\rm BD} }\)
~ \(\large\color{black}{ {\rm CB}= {\rm AB} }\)
~ \(\large\color{black}{ \angle {\rm ABD}= \angle {\rm CBD} }\)

Answer 2

ABD and CBD by SAS @DJ3strella

Answer 3

@SolomonZelman