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Mathematics
Problem
Points A, B and C are fixed and not collinear. Point D is on the same side of AB as C such that
∠
A
C
B
=
∠
A
D
B
\angle ACB = \angle ADB
∠
A
C
B
=
∠
A
D
B
. Explain why A, B, C and D lie on a common circle.
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