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Mathematics
Mathematics
Problem
In
△
A
B
C
\triangle ABC
△
A
B
C
,
A
B
=
A
C
AB = AC
A
B
=
A
C
. Side
B
C
BC
B
C
is produced to point
D
D
D
such that
∠
A
C
D
=
100
∘
\angle ACD = 100^{\circ}
∠
A
C
D
=
10
0
∘
. Find
∠
A
B
C
\angle ABC
∠
A
B
C
. a)
60
∘
60^{\circ}
6
0
∘
b)
80
∘
80^{\circ}
8
0
∘
c)
40
∘
40^{\circ}
4
0
∘
d)
50
∘
50^{\circ}
5
0
∘
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