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Mathematics
Mathematics
Problem
△
A
B
C
\triangle ABC
△
A
B
C
has
A
B
=
A
C
AB = AC
A
B
=
A
C
. Side
B
C
BC
B
C
is produced to
D
D
D
such that
∠
A
C
D
=
110
∘
\angle ACD = 110^\circ
∠
A
C
D
=
11
0
∘
. Find
∠
A
\angle A
∠
A
. a)
55
∘
55^{\circ}
5
5
∘
b)
110
∘
110^{\circ}
11
0
∘
c)
40
∘
40^{\circ}
4
0
∘
d)
70
∘
70^{\circ}
7
0
∘
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