Difference between revisions of "1998 IMO Problems/Problem 5"
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Revision as of 16:53, 23 March 2015
Let I be the incenter of triangle ABC. Let the incircle of ABC touch the sides BC, CA, and AB at K, L, and M , respectively. The line through B parallel to M K meets the lines LM and LK at R and S, respectively. Prove that angle RIS is acute.
