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Mathematics
Mathematics
Problem
In a cyclic quadrilateral
A
B
C
D
ABCD
A
B
C
D
, it is given that
A
B
=
B
C
AB = BC
A
B
=
B
C
and
∠
B
A
C
=
30
∘
\angle BAC = 30^\circ
∠
B
A
C
=
3
0
∘
. Calculate
∠
A
D
C
\angle ADC
∠
A
D
C
. a)
120
∘
120^\circ
12
0
∘
b)
60
∘
60^\circ
6
0
∘
c)
50
∘
50^\circ
5
0
∘
d)
90
∘
90^\circ
9
0
∘
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