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Mathematics
Mathematics
Problem
A, B and C are three points on a circle with centre O such that
∠
B
O
C
=
30
∘
\angle BOC = 30^\circ
∠
B
O
C
=
3
0
∘
and
∠
A
O
B
=
60
∘
\angle AOB = 60^\circ
∠
A
O
B
=
6
0
∘
. If D is a point on the circle other than the arc ABC, find
∠
A
D
C
\angle ADC
∠
A
D
C
.
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