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Mathematics
Mathematics
Problem
In a circle with centre
O
O
O
,
A
B
AB
A
B
is a diameter. Point
C
C
C
lies on the circle such that
A
C
=
C
B
AC = CB
A
C
=
C
B
. What is the measure of
∠
C
A
B
\angle CAB
∠
C
A
B
? a)
90
∘
90^{\circ}
9
0
∘
b)
45
∘
45^{\circ}
4
5
∘
c)
60
∘
60^{\circ}
6
0
∘
d)
30
∘
30^{\circ}
3
0
∘
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