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International Competitions
-- International Mathematical Olympiad
-- Middle European Mathematical Olympiad
Local Competitions
-- Croatian Competitions
-- -- Croatian Mathematical Olympiad
-- -- Croatian National Competitions
-- -- -- Grade 9
-- -- -- Grade 10
-- -- -- Grade 11
-- -- -- Grade 12
-- -- Croatian County-Level Competitions
-- -- -- Grade 9
-- -- -- Grade 10
-- -- -- Grade 11
-- -- -- Grade 12
-- -- Croatian School-Level Competitions
-- -- -- Grade 9
-- -- -- Grade 10
-- -- -- Grade 11
-- -- -- Grade 12
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24 results
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Problem
Source
Tags
Croatian Mathematical Olympiad 2012 Problem M-3
Croatian Mathematical Olympiad 2012
Circumcircle
Geometry
Orthocenter
Similarity
Triangle
Croatian Mathematical Olympiad 2013 Problem 1-3
Croatian Mathematical Olympiad 2013
Circumcircle
Geometry
Orthocenter
Parallelogram
Triangle
Croatian Mathematical Olympiad 2025 Problem 2-3
Croatian Mathematical Olympiad 2025
Circumcircle
Geometry
Incircle
Orthocenter
Triangle
International Mathematical Olympiad 2008 Problem 1
International Mathematical Olympiad 2008
Circle
Concyclic
Geometry
Orthocenter
Triangle
International Mathematical Olympiad 2013 Problem 4
International Mathematical Olympiad 2013
Circle
Collinear
Geometry
Orthocenter
Triangle
International Mathematical Olympiad 2015 Problem 3
International Mathematical Olympiad 2015
Circle
Circumcircle
Geometry
Orthocenter
Triangle
International Mathematical Olympiad 2025 Problem 2
International Mathematical Olympiad 2025
Circle
Circumcircle
Geometry
Orthocenter
Tangent
Middle European Mathematical Olympiad 2018 Problem T-5
Middle European Mathematical Olympiad 2018
Circumcircle
Geometry
Orthocenter
Parallelogram
Triangle
Middle European Mathematical Olympiad 2020 Problem I-3
Middle European Mathematical Olympiad 2020
Circumcircle
Geometry
Incircle
Orthocenter
Triangle
Grade 9 2020 Problem 3
Grade 9 2020
Angles
Geometry
Incircle
Orthocenter
Triangle
Grade 10 2026 Problem 5
Grade 10 2026
Circumcircle
Geometry
Orthocenter
Triangle
Grade 10 2023 Problem 4
Grade 10 2023
Geometry
Orthocenter
Right triangle
Triangle
Grade 10 2015 Problem 4
Grade 10 2015
Circumcircle
Geometry
Orthocenter
Triangle
Grade 11 2007 Problem 3
Grade 11 2007
Circumcircle
Geometry
Orthocenter
Triangle
Grade 11 2013 Problem 4
Grade 11 2013
Circle
Geometry
Orthocenter
Triangle
Grade 11 2016 Problem 4
Grade 11 2016
Circumcircle
Cyclic quad
Geometry
Orthocenter
Triangle
Grade 11 2017 Problem 4
Grade 11 2017
Circumcircle
Geometry
Orthocenter
Triangle
Grade 11 2023 Problem 5
Grade 11 2023
Geometry
Lengths
Orthocenter
Triangle
Grade 11 2021 Problem 1
Grade 11 2021
Geometry
Orthocenter
Triangle
Trigonometry
Grade 12 2005 Problem 4
Grade 12 2005
Angles
Area
Geometry
Orthocenter
Quad
Grade 12 2006 Problem 1
Grade 12 2006
Geometry
Orthocenter
Tangent
Triangle
Grade 12 2012 Problem 3
Grade 12 2012
Circumcircle
Geometry
Orthocenter
Perpendicularity
Triangle
Grade 12 2023 Problem 4
Grade 12 2023
Geometry
Lengths
Orthocenter
Triangle
Grade 12 2025 Problem 4
Grade 12 2025
Circumcircle
Geometry
Orthocenter
Tangent
Triangle