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Mathematics
Mathematics
Problem
ABCD is a cyclic quadrilateral in which
A
B
=
C
D
AB = CD
A
B
=
C
D
and
∠
A
B
C
=
60
∘
\angle ABC = 60^{\circ}
∠
A
B
C
=
6
0
∘
. Let
O
O
O
be the centre of the circle. (i) Find
∠
A
D
C
\angle ADC
∠
A
D
C
. (ii) Find
∠
A
O
C
\angle AOC
∠
A
O
C
.
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