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Problem	Source	Tags
Croatian Mathematical Olympiad 2015 Problem 2-3	Croatian Mathematical Olympiad 2015	Circumcircle Geometry Tangent Triangle
Croatian Mathematical Olympiad 2015 Problem M-3	Croatian Mathematical Olympiad 2015	Geometry Incircle Tangent Triangle
Croatian Mathematical Olympiad 2016 Problem 1-3	Croatian Mathematical Olympiad 2016	Circle Concyclic Cyclic quad Geometry Tangent
Croatian Mathematical Olympiad 2018 Problem 1-3	Croatian Mathematical Olympiad 2018	Circle Circumcircle Geometry Tangent
Croatian Mathematical Olympiad 2019 Problem M-3	Croatian Mathematical Olympiad 2019	Cyclic quad Geometry Incircle Tangent Triangle
Croatian Mathematical Olympiad 2020 Problem M-3	Croatian Mathematical Olympiad 2020	Circle Geometry Tangent Triangle
Croatian Mathematical Olympiad 2021 Problem 1-3	Croatian Mathematical Olympiad 2021	Circle Geometry Quad Tangent
Croatian Mathematical Olympiad 2023 Problem I-3	Croatian Mathematical Olympiad 2023	Circumcircle Collinear Geometry Quad Tangent
Croatian Mathematical Olympiad 2024 Problem 2-3	Croatian Mathematical Olympiad 2024	Circle Geometry Tangent
Croatian Mathematical Olympiad 2024 Problem M-3	Croatian Mathematical Olympiad 2024	Circle Circumcircle Geometry Tangent
International Mathematical Olympiad 1962 Problem 7	International Mathematical Olympiad 1962	Geometry 3D Tangent Tetrahedron
International Mathematical Olympiad 1964 Problem 3	International Mathematical Olympiad 1964	Circle Geometry Incircle Tangent Triangle
International Mathematical Olympiad 1969 Problem 4	International Mathematical Olympiad 1969	Circle Geometry Incircle Tangent Triangle
International Mathematical Olympiad 1983 Problem 2	International Mathematical Olympiad 1983	Angles Circle Geometry Tangent
International Mathematical Olympiad 1984 Problem 4	International Mathematical Olympiad 1984	Circle Geometry Quad Tangent
International Mathematical Olympiad 1985 Problem 1	International Mathematical Olympiad 1985	Circle Cyclic quad Geometry Tangent
International Mathematical Olympiad 1990 Problem 1	International Mathematical Olympiad 1990	Circle Geometry Tangent
International Mathematical Olympiad 1992 Problem 4	International Mathematical Olympiad 1992	Circle Geometry Incircle Tangent Triangle
International Mathematical Olympiad 1993 Problem 2	International Mathematical Olympiad 1993	Angles Circumcircle Geometry Tangent Triangle
International Mathematical Olympiad 1999 Problem 5	International Mathematical Olympiad 1999	Circle Geometry Tangent
International Mathematical Olympiad 2000 Problem 1	International Mathematical Olympiad 2000	Circle Collinear Geometry Tangent
International Mathematical Olympiad 2008 Problem 6	International Mathematical Olympiad 2008	Circle Geometry Incircle Quad Tangent
International Mathematical Olympiad 2009 Problem 2	International Mathematical Olympiad 2009	Circle Circumcircle Geometry Tangent Triangle
International Mathematical Olympiad 2010 Problem 4	International Mathematical Olympiad 2010	Circumcircle Geometry Lengths Tangent Triangle
International Mathematical Olympiad 2011 Problem 6	International Mathematical Olympiad 2011	Circumcircle Geometry Tangent Triangle
International Mathematical Olympiad 2012 Problem 1	International Mathematical Olympiad 2012	Circle Geometry Tangent Triangle
International Mathematical Olympiad 2013 Problem 3	International Mathematical Olympiad 2013	Circumcircle Geometry Tangent Triangle
International Mathematical Olympiad 2014 Problem 3	International Mathematical Olympiad 2014	Circle Circumcircle Geometry Quad Tangent
International Mathematical Olympiad 2017 Problem 4	International Mathematical Olympiad 2017	Circle Circumcircle Geometry Tangent
International Mathematical Olympiad 2021 Problem 4	International Mathematical Olympiad 2021	Circle Circumcircle Geometry Quad Tangent
International Mathematical Olympiad 2023 Problem 2	International Mathematical Olympiad 2023	Circle Circumcircle Geometry Tangent Triangle
International Mathematical Olympiad 2025 Problem 2	International Mathematical Olympiad 2025	Circle Circumcircle Geometry Orthocenter Tangent
Middle European Mathematical Olympiad 2011 Problem I-3	Middle European Mathematical Olympiad 2011	Circle Circumcircle Geometry Perpendicularity Tangent
Middle European Mathematical Olympiad 2011 Problem T-6	Middle European Mathematical Olympiad 2011	Circumcircle Geometry Perpendicularity Tangent Triangle
Middle European Mathematical Olympiad 2021 Problem I-3	Middle European Mathematical Olympiad 2021	Circumcircle Concyclic Geometry Perpendicularity Tangent
Middle European Mathematical Olympiad 2022 Problem T-5	Middle European Mathematical Olympiad 2022	Circle Circumcircle Geometry Tangent Triangle
Middle European Mathematical Olympiad 2022 Problem T-6	Middle European Mathematical Olympiad 2022	Circle Circumcircle Geometry Quad Tangent
Middle European Mathematical Olympiad 2023 Problem I-3	Middle European Mathematical Olympiad 2023	Geometry Incircle Perpendicularity Tangent Triangle
Middle European Mathematical Olympiad 2024 Problem I-3	Middle European Mathematical Olympiad 2024	Circle Circumcircle Geometry Tangent Triangle
Middle European Mathematical Olympiad 2025 Problem T-5	Middle European Mathematical Olympiad 2025	Circumcircle Geometry Parallelogram Tangent Triangle
Grade 9 1997 Problem 3	Grade 9 1997	Circle Geometry Tangent
Grade 9 1999 Problem 1	Grade 9 1999	Circle Geometry Lengths Tangent
Grade 9 2008 Problem 3	Grade 9 2008	Circle Geometry Tangent
Grade 9 2015 Problem 4	Grade 9 2015	Circle Geometry Tangent
Grade 9 2023 Problem 4	Grade 9 2023	Geometry Incircle Tangent Triangle
Grade 10 1996 Problem 4	Grade 10 1996	Circle Coord Functions Geometry Tangent
Grade 10 2001 Problem 2	Grade 10 2001	Circle Geometry Tangent Triangle
Grade 10 2006 Problem 3	Grade 10 2006	Circle Circumcircle Geometry Tangent
Grade 10 2012 Problem 3	Grade 10 2012	Circle Equilateral Geometry Tangent Triangle
Grade 10 2014 Problem 4	Grade 10 2014	Circle Geometry Tangent