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Problem	Source	Tags
Croatian Mathematical Olympiad 2012 Problem 1-3	Croatian Mathematical Olympiad 2012	Circle Cyclic quad Geometry Triangle
Croatian Mathematical Olympiad 2012 Problem 2-3	Croatian Mathematical Olympiad 2012	Cyclic quad Geometry Incircle Triangle
Croatian Mathematical Olympiad 2016 Problem 1-3	Croatian Mathematical Olympiad 2016	Circle Concyclic Cyclic quad Geometry Tangent
Croatian Mathematical Olympiad 2016 Problem M-3	Croatian Mathematical Olympiad 2016	Area Circle Cyclic quad Geometry
Croatian Mathematical Olympiad 2019 Problem 2-3	Croatian Mathematical Olympiad 2019	Cyclic quad Geometry Optimization Quad
Croatian Mathematical Olympiad 2019 Problem M-3	Croatian Mathematical Olympiad 2019	Cyclic quad Geometry Incircle Tangent Triangle
Croatian Mathematical Olympiad 2025 Problem 3-2	Croatian Mathematical Olympiad 2025	Circumcircle Cyclic quad Geometry Quad
International Mathematical Olympiad 1972 Problem 2	International Mathematical Olympiad 1972	Cyclic quad Geometry Quad
International Mathematical Olympiad 1985 Problem 1	International Mathematical Olympiad 1985	Circle Cyclic quad Geometry Tangent
International Mathematical Olympiad 1998 Problem 1	International Mathematical Olympiad 1998	Area Cyclic quad Geometry Perpendicularity Quad
International Mathematical Olympiad 2003 Problem 4	International Mathematical Olympiad 2003	Angles Cyclic quad Geometry Perpendicularity
International Mathematical Olympiad 2004 Problem 5	International Mathematical Olympiad 2004	Angles Cyclic quad Geometry Quad
International Mathematical Olympiad 2007 Problem 2	International Mathematical Olympiad 2007	Angles Circle Cyclic quad Geometry Parallelogram
Middle European Mathematical Olympiad 2009 Problem T-6	Middle European Mathematical Olympiad 2009	Angles Cyclic quad Geometry
Middle European Mathematical Olympiad 2010 Problem I-3	Middle European Mathematical Olympiad 2010	Circumcircle Collinear Cyclic quad Geometry
Middle European Mathematical Olympiad 2010 Problem T-6	Middle European Mathematical Olympiad 2010	Angles Cyclic quad Geometry Parallelogram
Middle European Mathematical Olympiad 2015 Problem I-3	Middle European Mathematical Olympiad 2015	Circle Circumcircle Concyclic Cyclic quad Geometry
Grade 10 2015 Problem 3	Grade 10 2015	Circle Cyclic quad Geometry Triangle
Grade 11 2016 Problem 4	Grade 11 2016	Circumcircle Cyclic quad Geometry Orthocenter Triangle