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Croatian Mathematical Olympiad 2011 Problem I-3Croatian Mathematical Olympiad 2011AnglesGeometryIncircleTriangle
Croatian Mathematical Olympiad 2012 Problem 2-3Croatian Mathematical Olympiad 2012Cyclic quadGeometryIncircleTriangle
Croatian Mathematical Olympiad 2013 Problem M-3Croatian Mathematical Olympiad 2013CircumcircleGeometryIncircleRight triangle
Croatian Mathematical Olympiad 2014 Problem 2-3Croatian Mathematical Olympiad 2014CircleCircumcircleGeometryIncircleTriangle
Croatian Mathematical Olympiad 2015 Problem M-3Croatian Mathematical Olympiad 2015GeometryIncircleTangentTriangle
Croatian Mathematical Olympiad 2016 Problem 2-3Croatian Mathematical Olympiad 2016CircleGeometryIncircleTriangle
Croatian Mathematical Olympiad 2017 Problem 1-3Croatian Mathematical Olympiad 2017AnglesCircumcircleGeometryIncircleTriangle
Croatian Mathematical Olympiad 2017 Problem I-3Croatian Mathematical Olympiad 2017CircumcircleGeometryIncircleIsoscelesTriangle
Croatian Mathematical Olympiad 2018 Problem 2-3Croatian Mathematical Olympiad 2018CircleCircumcircleGeometryIncircleTriangle
Croatian Mathematical Olympiad 2018 Problem I-3Croatian Mathematical Olympiad 2018CircleCircumcircleGeometryIncircleTriangle
Croatian Mathematical Olympiad 2019 Problem M-3Croatian Mathematical Olympiad 2019Cyclic quadGeometryIncircleTangentTriangle
Croatian Mathematical Olympiad 2020 Problem 1-3Croatian Mathematical Olympiad 2020CircumcircleGeometryIncirclePerpendicularityTriangle
Croatian Mathematical Olympiad 2020 Problem I-3Croatian Mathematical Olympiad 2020GeometryIncircleLengthsTriangle
Croatian Mathematical Olympiad 2022 Problem 2-3Croatian Mathematical Olympiad 2022CircumcircleGeometryIncirclePerpendicularityTriangle
Croatian Mathematical Olympiad 2025 Problem 2-3Croatian Mathematical Olympiad 2025CircumcircleGeometryIncircleOrthocenterTriangle
International Mathematical Olympiad 1962 Problem 5International Mathematical Olympiad 1962CircleConstructionGeometryIncircleQuad
International Mathematical Olympiad 1962 Problem 6International Mathematical Olympiad 1962CircumcircleGeometryIncircleIsoscelesTriangle
International Mathematical Olympiad 1964 Problem 3International Mathematical Olympiad 1964CircleGeometryIncircleTangentTriangle
International Mathematical Olympiad 1969 Problem 4International Mathematical Olympiad 1969CircleGeometryIncircleTangentTriangle
International Mathematical Olympiad 1970 Problem 1International Mathematical Olympiad 1970CircleGeometryIncircleTriangle
International Mathematical Olympiad 1978 Problem 4International Mathematical Olympiad 1978CircleCircumcircleGeometryIncircleTriangle
International Mathematical Olympiad 1981 Problem 5International Mathematical Olympiad 1981CircleCircumcircleGeometryIncircleTriangle
International Mathematical Olympiad 1982 Problem 2International Mathematical Olympiad 1982CollinearGeometryIncircleTriangle
International Mathematical Olympiad 1991 Problem 1International Mathematical Olympiad 1991GeometryIncircleInequalitiesOptimizationTriangle
International Mathematical Olympiad 1992 Problem 4International Mathematical Olympiad 1992CircleGeometryIncircleTangentTriangle
International Mathematical Olympiad 1996 Problem 2International Mathematical Olympiad 1996AnglesCollinearGeometryIncircleTriangle
International Mathematical Olympiad 1998 Problem 5International Mathematical Olympiad 1998AnglesGeometryIncircleTriangle
International Mathematical Olympiad 2000 Problem 6International Mathematical Olympiad 2000ConstructionGeometryIncircleTriangle
International Mathematical Olympiad 2002 Problem 2International Mathematical Olympiad 2002AnglesCircleGeometryIncirclePerpendicularity
International Mathematical Olympiad 2008 Problem 6International Mathematical Olympiad 2008CircleGeometryIncircleQuadTangent
International Mathematical Olympiad 2009 Problem 4International Mathematical Olympiad 2009AnglesGeometryIncircleIsoscelesTriangle
International Mathematical Olympiad 2010 Problem 2International Mathematical Olympiad 2010AnglesCircumcircleGeometryIncircleTriangle
International Mathematical Olympiad 2019 Problem 6International Mathematical Olympiad 2019CircumcircleGeometryIncirclePerpendicularityTriangle
International Mathematical Olympiad 2024 Problem 4International Mathematical Olympiad 2024AnglesCircumcircleGeometryIncircleTriangle
Middle European Mathematical Olympiad 2010 Problem T-5Middle European Mathematical Olympiad 2010GeometryIncircleParallelogramTriangle
Middle European Mathematical Olympiad 2015 Problem T-6Middle European Mathematical Olympiad 2015AnglesCircumcircleGeometryIncircleTriangle
Middle European Mathematical Olympiad 2016 Problem T-6Middle European Mathematical Olympiad 2016AnglesGeometryIncirclePerpendicularityTriangle
Middle European Mathematical Olympiad 2020 Problem I-3Middle European Mathematical Olympiad 2020CircumcircleGeometryIncircleOrthocenterTriangle
Middle European Mathematical Olympiad 2023 Problem I-3Middle European Mathematical Olympiad 2023GeometryIncirclePerpendicularityTangentTriangle
Middle European Mathematical Olympiad 2023 Problem T-6Middle European Mathematical Olympiad 2023AnglesGeometryIncirclePerpendicularityTriangle
Middle European Mathematical Olympiad 2025 Problem I-3Middle European Mathematical Olympiad 2025CircleCircumcircleGeometryIncircleTriangle
Grade 9 1992 Problem 2Grade 9 1992AreaGeometryIncircleRight triangleTriangle
Grade 9 2000 Problem 2Grade 9 2000AnglesGeometryIncircleTriangle
Grade 9 2001 Problem 2Grade 9 2001CoordGeometryIncircleSquare
Grade 9 2005 Problem 2Grade 9 2005AnglesGeometryIncircleSimilarityTriangle
Grade 9 2019 Problem 2Grade 9 2019GeometryIncircleNTRight triangleTriangle
Grade 9 2020 Problem 3Grade 9 2020AnglesGeometryIncircleOrthocenterTriangle
Grade 9 2023 Problem 4Grade 9 2023GeometryIncircleTangentTriangle
Grade 10 1992 Problem 1Grade 10 1992GeometryIncircleRight triangleTriangle
Grade 10 2005 Problem 2Grade 10 2005CircumcircleGeometryIncircleTriangle