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G2.
New Problem
Geometry
2
Let
A
A
A
,
B
B
B
,
C
C
C
,
D
D
D
be four points on a circle, in that order. If
A
C
=
B
D
AC = BD
A
C
=
B
D
, prove that
A
D
∣
∣
B
C
AD || BC
A
D
∣∣
BC
Written by Howard Halim
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