How many semi finals has arsenal played in champions league?

10. FA Cup Winners (10): 1929-30, 1935-36, 1949-50, 1970-71, 1978-79, 1992-93, 1997-98, 2001-02, 2002-03, 2004-05 Runners-up (7): 1926-27, 1931-32, 1951-52, 1971-72, 1977-78, 1979-80, 2000-01 From Wikipedia/Arsenal F.C.