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Mathematics
Mathematics
Problem
In a circle with centre
O
O
O
, points
A
,
B
,
C
,
A, B, C,
A
,
B
,
C
,
and
D
D
D
lie on the circumference. If
∠
A
O
B
=
∠
C
O
D
\angle AOB = \angle COD
∠
A
O
B
=
∠
C
O
D
, which one of the following must be true? a)
A
D
=
B
C
AD = BC
A
D
=
B
C
b)
A
B
=
C
D
AB = CD
A
B
=
C
D
c)
O
A
=
C
D
OA = CD
O
A
=
C
D
d)
A
B
=
B
C
AB = BC
A
B
=
B
C
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