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Problem	Source	Tags
International Mathematical Olympiad 2012 Problem 5	International Mathematical Olympiad 2012	Geometry Perpendicularity Right triangle Triangle
International Mathematical Olympiad 2013 Problem 3	International Mathematical Olympiad 2013	Circumcircle Geometry Tangent Triangle
International Mathematical Olympiad 2013 Problem 4	International Mathematical Olympiad 2013	Circle Collinear Geometry Orthocenter Triangle
International Mathematical Olympiad 2014 Problem 4	International Mathematical Olympiad 2014	Angles Circumcircle Geometry Triangle
International Mathematical Olympiad 2015 Problem 3	International Mathematical Olympiad 2015	Circle Circumcircle Geometry Orthocenter Triangle
International Mathematical Olympiad 2015 Problem 4	International Mathematical Olympiad 2015	Circle Circumcircle Collinear Geometry Triangle
International Mathematical Olympiad 2016 Problem 1	International Mathematical Olympiad 2016	Geometry Parallelogram Right triangle Triangle
International Mathematical Olympiad 2018 Problem 1	International Mathematical Olympiad 2018	Circumcircle Geometry Perpendicularity Triangle
International Mathematical Olympiad 2019 Problem 2	International Mathematical Olympiad 2019	Angles Concyclic Geometry Triangle
International Mathematical Olympiad 2019 Problem 6	International Mathematical Olympiad 2019	Circumcircle Geometry Incircle Perpendicularity Triangle
International Mathematical Olympiad 2021 Problem 3	International Mathematical Olympiad 2021	Angles Circumcircle Geometry Triangle
International Mathematical Olympiad 2023 Problem 2	International Mathematical Olympiad 2023	Circle Circumcircle Geometry Tangent Triangle
International Mathematical Olympiad 2024 Problem 4	International Mathematical Olympiad 2024	Angles Circumcircle Geometry Incircle Triangle
Middle European Mathematical Olympiad 2010 Problem T-5	Middle European Mathematical Olympiad 2010	Geometry Incircle Parallelogram Triangle
Middle European Mathematical Olympiad 2011 Problem T-6	Middle European Mathematical Olympiad 2011	Circumcircle Geometry Perpendicularity Tangent Triangle
Middle European Mathematical Olympiad 2013 Problem I-3	Middle European Mathematical Olympiad 2013	Angles Geometry Isosceles Perpendicularity Triangle
Middle European Mathematical Olympiad 2013 Problem T-5	Middle European Mathematical Olympiad 2013	Construction Geometry Triangle
Middle European Mathematical Olympiad 2013 Problem T-6	Middle European Mathematical Olympiad 2013	Circle Circumcircle Geometry Triangle
Middle European Mathematical Olympiad 2015 Problem T-5	Middle European Mathematical Olympiad 2015	Angles Circle Concyclic Geometry Triangle
Middle European Mathematical Olympiad 2015 Problem T-6	Middle European Mathematical Olympiad 2015	Angles Circumcircle Geometry Incircle Triangle
Middle European Mathematical Olympiad 2016 Problem I-2	Middle European Mathematical Olympiad 2016	Combinatorics Optimization Triangle
Middle European Mathematical Olympiad 2016 Problem I-3	Middle European Mathematical Olympiad 2016	Angles Circle Geometry Perpendicularity Triangle
Middle European Mathematical Olympiad 2016 Problem T-5	Middle European Mathematical Olympiad 2016	Circle Circumcircle Geometry Triangle
Middle European Mathematical Olympiad 2016 Problem T-6	Middle European Mathematical Olympiad 2016	Angles Geometry Incircle Perpendicularity Triangle
Middle European Mathematical Olympiad 2018 Problem I-3	Middle European Mathematical Olympiad 2018	Centroid Concyclic Geometry Triangle
Middle European Mathematical Olympiad 2018 Problem T-5	Middle European Mathematical Olympiad 2018	Circumcircle Geometry Orthocenter Parallelogram Triangle
Middle European Mathematical Olympiad 2018 Problem T-6	Middle European Mathematical Olympiad 2018	Circumcircle Collinear Geometry Perpendicularity Triangle
Middle European Mathematical Olympiad 2019 Problem I-3	Middle European Mathematical Olympiad 2019	Circle Circumcircle Concyclic Geometry Triangle
Middle European Mathematical Olympiad 2019 Problem T-5	Middle European Mathematical Olympiad 2019	Angles Circumcircle Geometry Perpendicularity Triangle
Middle European Mathematical Olympiad 2019 Problem T-6	Middle European Mathematical Olympiad 2019	Circumcircle Collinear Geometry Right triangle Triangle
Middle European Mathematical Olympiad 2020 Problem I-3	Middle European Mathematical Olympiad 2020	Circumcircle Geometry Incircle Orthocenter Triangle
Middle European Mathematical Olympiad 2021 Problem T-5	Middle European Mathematical Olympiad 2021	Circumcircle Geometry Perpendicularity Triangle
Middle European Mathematical Olympiad 2021 Problem T-6	Middle European Mathematical Olympiad 2021	Angles Circumcircle Geometry Triangle
Middle European Mathematical Olympiad 2022 Problem T-5	Middle European Mathematical Olympiad 2022	Circle Circumcircle Geometry Tangent Triangle
Middle European Mathematical Olympiad 2023 Problem I-3	Middle European Mathematical Olympiad 2023	Geometry Incircle Perpendicularity Tangent Triangle
Middle European Mathematical Olympiad 2023 Problem T-6	Middle European Mathematical Olympiad 2023	Angles Geometry Incircle Perpendicularity Triangle
Middle European Mathematical Olympiad 2024 Problem I-3	Middle European Mathematical Olympiad 2024	Circle Circumcircle Geometry Tangent Triangle
Middle European Mathematical Olympiad 2024 Problem T-5	Middle European Mathematical Olympiad 2024	Angles Circumcircle Geometry Triangle
Middle European Mathematical Olympiad 2024 Problem T-6	Middle European Mathematical Olympiad 2024	Geometry Perpendicularity Triangle
Middle European Mathematical Olympiad 2025 Problem I-3	Middle European Mathematical Olympiad 2025	Circle Circumcircle Geometry Incircle Triangle
Middle European Mathematical Olympiad 2025 Problem T-5	Middle European Mathematical Olympiad 2025	Circumcircle Geometry Parallelogram Tangent Triangle
Middle European Mathematical Olympiad 2025 Problem T-6	Middle European Mathematical Olympiad 2025	Angles Circumcircle Geometry Triangle
Grade 9 1992 Problem 2	Grade 9 1992	Area Geometry Incircle Right triangle Triangle
Grade 9 2000 Problem 2	Grade 9 2000	Angles Geometry Incircle Triangle
Grade 9 2003 Problem 1	Grade 9 2003	Area Geometry NT Primes Triangle
Grade 9 2003 Problem 3	Grade 9 2003	Angles Area Geometry Isosceles Triangle
Grade 9 2004 Problem 2	Grade 9 2004	Centroid Geometry Perpendicularity Triangle
Grade 9 2005 Problem 2	Grade 9 2005	Angles Geometry Incircle Similarity Triangle
Grade 9 2005 Problem 4	Grade 9 2005	Angles Circumcircle Geometry Triangle
Grade 9 2006 Problem 3	Grade 9 2006	Equilateral Geometry Triangle