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Mathematics
Mathematics
Problem
In a circle with centre
O
O
O
, chords
A
B
AB
A
B
and
C
D
CD
C
D
are equal. If
∠
A
O
B
=
72
∘
\angle AOB = 72^{\circ}
∠
A
O
B
=
7
2
∘
, find
∠
C
O
D
\angle COD
∠
C
O
D
.
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