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Isosceles

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Croatian Mathematical Olympiad 2013 Problem I-3Croatian Mathematical Olympiad 2013CircumcircleGeometryIsoscelesPerpendicularityTriangle
Croatian Mathematical Olympiad 2017 Problem I-3Croatian Mathematical Olympiad 2017CircumcircleGeometryIncircleIsoscelesTriangle
Croatian Mathematical Olympiad 2019 Problem 1-3Croatian Mathematical Olympiad 2019ConcyclicGeometryIsoscelesTriangle
International Mathematical Olympiad 1962 Problem 6International Mathematical Olympiad 1962CircumcircleGeometryIncircleIsoscelesTriangle
International Mathematical Olympiad 1966 Problem 2International Mathematical Olympiad 1966GeometryIsoscelesTriangleTrigonometry
International Mathematical Olympiad 1994 Problem 2International Mathematical Olympiad 1994CollinearGeometryIsoscelesPerpendicularity
International Mathematical Olympiad 2009 Problem 4International Mathematical Olympiad 2009AnglesGeometryIncircleIsoscelesTriangle
Middle European Mathematical Olympiad 2013 Problem I-3Middle European Mathematical Olympiad 2013AnglesGeometryIsoscelesPerpendicularityTriangle
Grade 9 2003 Problem 3Grade 9 2003AnglesAreaGeometryIsoscelesTriangle
Grade 9 2019 Problem 5Grade 9 2019AnglesGeometryIsoscelesPerpendicularityTriangle
Grade 9 2022 Problem 3Grade 9 2022AnglesGeometryIsoscelesSimilarityTriangle
Grade 9 2018 Problem 4Grade 9 2018GeometryIsoscelesTriangle
Grade 9 2019 Problem 4Grade 9 2019AreaGeometryIsoscelesPerpendicularityTriangle
Grade 10 2011 Problem 4Grade 10 2011AnglesGeometryIsoscelesTriangle
Grade 11 2002 Problem 1Grade 11 2002CircumcircleGeometryIsoscelesTriangle
Grade 11 2006 Problem 2Grade 11 2006GeometryIsoscelesPerpendicularityTriangle
Grade 11 2011 Problem 3Grade 11 2011AnglesGeometryIsoscelesTriangle
Grade 11 2018 Problem 4Grade 11 2018CircumcircleEquilateralGeometryIsoscelesTriangle
Grade 11 2016 Problem 3Grade 11 2016CircumcircleGeometryIsoscelesTriangle
Grade 12 2025 Problem 4Grade 12 2025AnglesGeometryIsoscelesTriangle