Circumcircle, circumcenter, and circumradius — AMC & AIME Problems
Practice every real AMC 8, AMC 10, AMC 12, and AIME problem that uses circumcircle, circumcenter, and circumradius — a geometry concept — each with a professionally curated solution, many with a video solution too, from LIVE by Po-Shen Loh. Browse all concepts or the full past-contest archive.
All of these problems are used with official legal permission of the Mathematical Association of America (MAA).
AMC 10
2003 AMC 10A Problem 17 · 2004 AMC 10B Problem 22 · 2007 AMC 10B Problem 4 · 2007 AMC 10B Problem 11 · 2015 AMC 10B Problem 19 · 2019 AMC 10A Problem 6 · 2021 AMC 10A Fall Problem 15 · 2023 AMC 10B Problem 3 · 2025 AMC 10B Problem 5
AMC 12
2003 AMC 12A Problem 11 · 2007 AMC 12A Problem 10 · 2011 AMC 12A Problem 25 · 2011 AMC 12B Problem 20 · 2015 AMC 12B Problem 19 · 2018 AMC 12B Problem 21 · 2021 AMC 12B Fall Problem 9
AIME
2000 AIME II Problem 12 · 2003 AIME II Problem 7 · 2007 AIME II Problem 15 · 2010 AIME II Problem 14 · 2011 AIME II Problem 13 · 2014 AIME II Problem 14 · 2015 AIME II Problem 11 · 2017 AIME I Problem 4 · 2020 AIME I Problem 15 · 2021 AIME II Problem 14 · 2024 AIME II Problem 10 · 2026 AIME I Problem 10