MathDB

3

Part of 1996 Italy TST

Problems(1)

italy TST

Source: Italian IMO Team Selection Test 1996

5/5/2017
3.Let ABCD be a parallelogram with side AB longer than AD and acute angle ∠DAB\angle DAB. The bisector of ∠DAB meets side CD at L and line BC at K. If O is the circumcenter of triangle LCK, prove that the points B,C,O,D lie on a circle.
geometry