Hightlight of the week
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2024/10/14 New official mock test from AOPS
2024/10/01 New problem set made by high quality contests created by wikjay, ijco, and megahertz13
2024/09/24 You can now do AMC mock tests with high quality contests created by AOPS community
2024/09/23 Video tutorial parent guide how to use the website
2024/09/23 We added 500 new questions to Math Trainer, you can practice all questions from the famouse CEMC (Waterloo, Canada) Math Contest
2024/09/14 New Math Trainer, you can practice your quest and your own practice problems
2024/09/05 New Berkeley Math tournament contests now available
2024/09/01 Start doing online contest and boost your contest rating. Congrats Yin Lam (1743), Emerio Diaziii (1682), John (1682),
Problem of the day
![[asy] for (int i=0; i<9; ++i) { draw(dir(10+40*i)--dir(50+40*i)); } draw(dir(50) -- dir(90)); label("$a$", dir(50) -- dir(90), N); draw(dir(10) -- dir(90)); label("$b$", dir(10) -- dir(90), SW); draw(dir(-70) -- dir(90)); label("$d$", dir(-70) -- dir(90), E); //Credit to MSTang for the diagram [/asy]](http://latex.artofproblemsolving.com/c/5/d/c5d372c564b6b059dc5b124a1c926be386b9ff26.png)
If 
, and 
are the lengths of a side, a shortest diagonal and a longest diagonal, respectively,
of a regular nonagon (see adjoining figure), then
Latest update
- 2024/08/28 Checkout new AMC 10 Counting Mock test 1
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- 2024/08/18 Congratulations to BoredApe, Justin Kchao for a successfully Competify contest Test 2 (leaderboard)
- 2024/08/13 Checkout 100 new questions in AMC 8 Number Theory
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- New challenge for 5-8 grade Competify challenge Set 2!!!.
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- August 2024: Try our new AMC 10 courses version 2.
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