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Mathematics
Mathematics
Problem
A circle has two chords
A
B
AB
A
B
and
C
D
CD
C
D
such that
A
B
=
8
cm
AB = 8\,\text{cm}
A
B
=
8
cm
and
C
D
=
A
B
CD = AB
C
D
=
A
B
. If
∠
C
O
D
=
75
∘
\angle COD = 75^{\circ}
∠
C
O
D
=
7
5
∘
, then
∠
A
O
B
\angle AOB
∠
A
O
B
equals a)
37.5
∘
37.5^{\circ}
37.
5
∘
b)
90
∘
90^{\circ}
9
0
∘
c)
75
∘
75^{\circ}
7
5
∘
d)
105
∘
105^{\circ}
10
5
∘
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