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Mathematics
Mathematics
Problem
In
△
A
B
C
\triangle ABC
△
A
B
C
, it is given that
A
B
=
A
C
AB = AC
A
B
=
A
C
. Let
D
D
D
be the midpoint of
B
C
BC
B
C
. a. Prove that
△
A
B
D
≅
△
A
C
D
\triangle ABD \cong \triangle ACD
△
A
B
D
≅
△
A
C
D
. b. Show that
A
D
⊥
B
C
AD \perp BC
A
D
⊥
B
C
. c. Show that
A
D
AD
A
D
bisects
∠
A
\angle A
∠
A
. Explain your reasoning in each step.
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