« Vrati se
Let I be the incenter of triangle ABC. Let K,L and M be the points of tangency of the incircle of ABC with AB,BC and CA, respectively. The line t passes through B and is parallel to KL. The lines MK and ML intersect t at the points R and S. Prove that \angle RIS is acute.

Slični zadaci

#NaslovOznakeRj.KvalitetaTežina
1866IMO Shortlist 1993 problem G42
1890IMO Shortlist 1994 problem G47
1995IMO Shortlist 1998 problem G18
1998IMO Shortlist 1998 problem G42
2108IMO Shortlist 2002 problem G314
2193IMO Shortlist 2005 problem G410