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Mathematics
Mathematics
Problem
Points A, B and C lie on a circle with centre O. If
∠
A
O
B
=
100
∘
\angle AOB = 100^{\circ}
∠
A
O
B
=
10
0
∘
and
∠
A
B
C
=
30
∘
\angle ABC = 30^{\circ}
∠
A
B
C
=
3
0
∘
, determine
∠
B
A
C
\angle BAC
∠
B
A
C
. a)
80
∘
80^{\circ}
8
0
∘
b)
50
∘
50^{\circ}
5
0
∘
c)
100
∘
100^{\circ}
10
0
∘
d)
115
∘
115^{\circ}
11
5
∘
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