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Mathematics
Mathematics
Problem
In a circle with centre
O
O
O
, points
A
,
B
A, B
A
,
B
and
C
C
C
lie on the circumference such that
∠
A
O
B
=
100
∘
\angle AOB = 100^{\circ}
∠
A
O
B
=
10
0
∘
and
∠
B
O
C
=
60
∘
\angle BOC = 60^{\circ}
∠
B
O
C
=
6
0
∘
. Calculate
∠
A
B
C
\angle ABC
∠
A
B
C
.
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