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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
lie on the circumference in that order. If
∠
A
O
B
=
112
∘
\angle AOB = 112^{\circ}
∠
A
O
B
=
11
2
∘
and
∠
B
O
C
=
84
∘
\angle BOC = 84^{\circ}
∠
B
O
C
=
8
4
∘
, calculate
∠
A
B
C
\angle ABC
∠
A
B
C
. a)
56
∘
56^{\circ}
5
6
∘
b)
82
∘
82^{\circ}
8
2
∘
c)
98
∘
98^{\circ}
9
8
∘
d)
42
∘
42^{\circ}
4
2
∘
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