IMO Shortlist 1985 problem 20
Dodao/la:
arhiva2. travnja 2012. A circle whose center is on the side
of the cyclic quadrilateral
touches the other three sides. Prove that
%V0
A circle whose center is on the side $ED$ of the cyclic quadrilateral $BCDE$ touches the other three sides. Prove that $EB+CD = ED.$
Izvor: Međunarodna matematička olimpijada, shortlist 1985