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Mathematics
Mathematics
Problem
In cyclic quadrilateral
A
B
C
D
ABCD
A
B
C
D
, sides
A
B
AB
A
B
and
B
C
BC
B
C
are equal. If
∠
A
D
C
=
100
∘
\angle ADC = 100^{\circ}
∠
A
D
C
=
10
0
∘
, find
∠
B
A
C
\angle BAC
∠
B
A
C
. a)
40
∘
40^{\circ}
4
0
∘
b)
50
∘
50^{\circ}
5
0
∘
c)
60
∘
60^{\circ}
6
0
∘
d)
80
∘
80^{\circ}
8
0
∘
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