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Croatian Mathematical Olympiad 2015 Problem I-3Croatian Mathematical Olympiad 2015AnglesGeometryQuad
Croatian Mathematical Olympiad 2019 Problem 2-3Croatian Mathematical Olympiad 2019Cyclic quadGeometryOptimizationQuad
Croatian Mathematical Olympiad 2021 Problem 1-3Croatian Mathematical Olympiad 2021CircleGeometryQuadTangent
Croatian Mathematical Olympiad 2021 Problem I-3Croatian Mathematical Olympiad 2021CircleConcyclicGeometryQuad
Croatian Mathematical Olympiad 2021 Problem M-3Croatian Mathematical Olympiad 2021CircleGeometryQuadSimilarity
Croatian Mathematical Olympiad 2023 Problem I-3Croatian Mathematical Olympiad 2023CircumcircleCollinearGeometryQuadTangent
Croatian Mathematical Olympiad 2025 Problem 3-2Croatian Mathematical Olympiad 2025CircumcircleCyclic quadGeometryQuad
International Mathematical Olympiad 1962 Problem 5International Mathematical Olympiad 1962CircleConstructionGeometryIncircleQuad
International Mathematical Olympiad 1969 Problem 5International Mathematical Olympiad 1969CombinatoricsCountingGeometryQuad
International Mathematical Olympiad 1972 Problem 2International Mathematical Olympiad 1972Cyclic quadGeometryQuad
International Mathematical Olympiad 1976 Problem 1International Mathematical Olympiad 1976AreaGeometryOptimizationQuad
International Mathematical Olympiad 1984 Problem 4International Mathematical Olympiad 1984CircleGeometryQuadTangent
International Mathematical Olympiad 1989 Problem 4International Mathematical Olympiad 1989GeometryInequalitiesOptimizationQuad
International Mathematical Olympiad 1998 Problem 1International Mathematical Olympiad 1998AreaCyclic quadGeometryPerpendicularityQuad
International Mathematical Olympiad 2004 Problem 5International Mathematical Olympiad 2004AnglesCyclic quadGeometryQuad
International Mathematical Olympiad 2005 Problem 5International Mathematical Olympiad 2005CircumcircleGeometryQuad
International Mathematical Olympiad 2008 Problem 6International Mathematical Olympiad 2008CircleGeometryIncircleQuadTangent
International Mathematical Olympiad 2014 Problem 3International Mathematical Olympiad 2014CircleCircumcircleGeometryQuadTangent
International Mathematical Olympiad 2018 Problem 6International Mathematical Olympiad 2018AnglesGeometryQuad
International Mathematical Olympiad 2020 Problem 1International Mathematical Olympiad 2020AnglesGeometryPerpendicularityQuad
International Mathematical Olympiad 2021 Problem 4International Mathematical Olympiad 2021CircleCircumcircleGeometryQuadTangent
Middle European Mathematical Olympiad 2009 Problem I-3Middle European Mathematical Olympiad 2009AnglesGeometryQuad
Middle European Mathematical Olympiad 2022 Problem T-6Middle European Mathematical Olympiad 2022CircleCircumcircleGeometryQuadTangent
Middle European Mathematical Olympiad 2023 Problem T-5Middle European Mathematical Olympiad 2023ConcyclicGeometryPerpendicularityQuad
Grade 9 2009 Problem 2Grade 9 2009AreaGeometryQuad
Grade 9 2011 Problem 4Grade 9 2011CircleGeometryPerpendicularityQuad
Grade 10 1996 Problem 3Grade 10 1996AreaGeometryParallelogramQuad
Grade 10 2008 Problem 4Grade 10 2008AnglesAreaGeometryQuad
Grade 10 2009 Problem 2Grade 10 2009CircumcircleConcyclicGeometryQuad
Grade 10 2026 Problem 6Grade 10 2026AnglesGeometryQuad
Grade 10 2024 Problem 4Grade 10 2024CircleGeometryQuad
Grade 11 2012 Problem 4Grade 11 2012DivisibilityGeometryNTQuad
Grade 11 2016 Problem 1Grade 11 2016GeometryQuadTrigonometry
Grade 11 2015 Problem 4Grade 11 2015AnglesGeometryQuad
Grade 11 2018 Problem 4Grade 11 2018AnglesGeometryPerpendicularityQuad
Grade 11 2026 Problem 4Grade 11 2026AnglesAreaGeometryQuad
Grade 12 2005 Problem 4Grade 12 2005AnglesAreaGeometryOrthocenterQuad
Grade 12 2010 Problem 4Grade 12 2010GeometryIncircleQuad
Grade 12 2014 Problem 5Grade 12 2014AnglesGeometryQuad
Grade 12 2016 Problem 3Grade 12 2016AnglesGeometryQuad