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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
. Point
D
D
D
lies on
A
C
AC
A
C
with
A
D
=
A
B
AD = AB
A
D
=
A
B
. If
∠
A
B
D
=
20
∘
\angle ABD = 20^\circ
∠
A
B
D
=
2
0
∘
, determine
∠
A
C
B
\angle ACB
∠
A
C
B
. a)
40
∘
40^{\circ}
4
0
∘
b)
60
∘
60^{\circ}
6
0
∘
c)
20
∘
20^{\circ}
2
0
∘
d)
140
∘
140^{\circ}
14
0
∘
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