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Parallelogram

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Croatian Mathematical Olympiad 2013 Problem 1-3Croatian Mathematical Olympiad 2013CircumcircleGeometryOrthocenterParallelogramTriangle
Croatian Mathematical Olympiad 2022 Problem 1-3Croatian Mathematical Olympiad 2022CircleCircumcircleGeometryParallelogramTriangle
Croatian Mathematical Olympiad 2022 Problem M-3Croatian Mathematical Olympiad 2022CircumcircleCollinearGeometryParallelogram
Croatian Mathematical Olympiad 2023 Problem 1-3Croatian Mathematical Olympiad 2023CircumcircleGeometryParallelogramPolygon
International Mathematical Olympiad 1967 Problem 1International Mathematical Olympiad 1967CircleGeometryInequalitiesParallelogram
International Mathematical Olympiad 2007 Problem 2International Mathematical Olympiad 2007AnglesCircleCyclic quadGeometryParallelogram
International Mathematical Olympiad 2016 Problem 1International Mathematical Olympiad 2016GeometryParallelogramRight triangleTriangle
Middle European Mathematical Olympiad 2009 Problem T-5Middle European Mathematical Olympiad 2009CircleCircumcircleGeometryParallelogram
Middle European Mathematical Olympiad 2010 Problem T-5Middle European Mathematical Olympiad 2010GeometryIncircleParallelogramTriangle
Middle European Mathematical Olympiad 2010 Problem T-6Middle European Mathematical Olympiad 2010AnglesCyclic quadGeometryParallelogram
Middle European Mathematical Olympiad 2018 Problem T-5Middle European Mathematical Olympiad 2018CircumcircleGeometryOrthocenterParallelogramTriangle
Middle European Mathematical Olympiad 2022 Problem I-3Middle European Mathematical Olympiad 2022CircumcircleCollinearGeometryParallelogram
Middle European Mathematical Olympiad 2025 Problem T-5Middle European Mathematical Olympiad 2025CircumcircleGeometryParallelogramTangentTriangle
Grade 9 2025 Problem 5Grade 9 2025AnglesGeometryParallelogram
Grade 9 2022 Problem 3Grade 9 2022GeometryParallelogramPerpendicularity
Grade 10 1996 Problem 3Grade 10 1996AreaGeometryParallelogramQuad
Grade 10 2023 Problem 4Grade 10 2023GeometryParallelogramPerpendicularity
Grade 11 1997 Problem 4Grade 11 1997GeometryParallelogramSimilarityTriangle
Grade 11 2001 Problem 1Grade 11 2001CollinearCoordGeometryParallelogram
Grade 11 2023 Problem 7Grade 11 2023CircleGeometryParallelogramTangent
Grade 12 2008 Problem 3Grade 12 2008GeometryParallelogramSquareTriangle