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Mathematics
Mathematics
Problem
In a circle with centre
O
O
O
,
A
B
AB
A
B
is a diameter and
C
C
C
is any other point on the circle. If
∠
A
B
C
=
30
∘
\angle ABC = 30^\circ
∠
A
B
C
=
3
0
∘
, find the measure of
∠
A
O
C
\angle AOC
∠
A
O
C
. a)
30
∘
30^{\circ}
3
0
∘
b)
60
∘
60^{\circ}
6
0
∘
c)
90
∘
90^{\circ}
9
0
∘
d)
120
∘
120^{\circ}
12
0
∘
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