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k a May Highlights and 2025 AoPS Online Class Information
jlacosta   0
Thursday at 11:16 PM
May is an exciting month! National MATHCOUNTS is the second week of May in Washington D.C. and our Founder, Richard Rusczyk will be presenting a seminar, Preparing Strong Math Students for College and Careers, on May 11th.

Are you interested in working towards MATHCOUNTS and don’t know where to start? We have you covered! If you have taken Prealgebra, then you are ready for MATHCOUNTS/AMC 8 Basics. Already aiming for State or National MATHCOUNTS and harder AMC 8 problems? Then our MATHCOUNTS/AMC 8 Advanced course is for you.

Summer camps are starting next month at the Virtual Campus in math and language arts that are 2 - to 4 - weeks in duration. Spaces are still available - don’t miss your chance to have an enriching summer experience. There are middle and high school competition math camps as well as Math Beasts camps that review key topics coupled with fun explorations covering areas such as graph theory (Math Beasts Camp 6), cryptography (Math Beasts Camp 7-8), and topology (Math Beasts Camp 8-9)!

Be sure to mark your calendars for the following upcoming events:
[list][*]May 9th, 4:30pm PT/7:30pm ET, Casework 2: Overwhelming Evidence — A Text Adventure, a game where participants will work together to navigate the map, solve puzzles, and win! All are welcome.
[*]May 19th, 4:30pm PT/7:30pm ET, What's Next After Beast Academy?, designed for students finishing Beast Academy and ready for Prealgebra 1.
[*]May 20th, 4:00pm PT/7:00pm ET, Mathcamp 2025 Qualifying Quiz Part 1 Math Jam, Problems 1 to 4, join the Canada/USA Mathcamp staff for this exciting Math Jam, where they discuss solutions to Problems 1 to 4 of the 2025 Mathcamp Qualifying Quiz!
[*]May 21st, 4:00pm PT/7:00pm ET, Mathcamp 2025 Qualifying Quiz Part 2 Math Jam, Problems 5 and 6, Canada/USA Mathcamp staff will discuss solutions to Problems 5 and 6 of the 2025 Mathcamp Qualifying Quiz![/list]
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All classes run 7:30pm-8:45pm ET/4:30pm - 5:45pm PT unless otherwise noted.

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0 replies
jlacosta
Thursday at 11:16 PM
0 replies
k i Adding contests to the Contest Collections
dcouchman   1
N Apr 5, 2023 by v_Enhance
Want to help AoPS remain a valuable Olympiad resource? Help us add contests to AoPS's Contest Collections.

Find instructions and a list of contests to add here: https://artofproblemsolving.com/community/c40244h1064480_contests_to_add
1 reply
dcouchman
Sep 9, 2019
v_Enhance
Apr 5, 2023
k i Zero tolerance
ZetaX   49
N May 4, 2019 by NoDealsHere
Source: Use your common sense! (enough is enough)
Some users don't want to learn, some other simply ignore advises.
But please follow the following guideline:


To make it short: ALWAYS USE YOUR COMMON SENSE IF POSTING!
If you don't have common sense, don't post.


More specifically:

For new threads:


a) Good, meaningful title:
The title has to say what the problem is about in best way possible.
If that title occured already, it's definitely bad. And contest names aren't good either.
That's in fact a requirement for being able to search old problems.

Examples:
Bad titles:
- "Hard"/"Medium"/"Easy" (if you find it so cool how hard/easy it is, tell it in the post and use a title that tells us the problem)
- "Number Theory" (hey guy, guess why this forum's named that way¿ and is it the only such problem on earth¿)
- "Fibonacci" (there are millions of Fibonacci problems out there, all posted and named the same...)
- "Chinese TST 2003" (does this say anything about the problem¿)
Good titles:
- "On divisors of a³+2b³+4c³-6abc"
- "Number of solutions to x²+y²=6z²"
- "Fibonacci numbers are never squares"


b) Use search function:
Before posting a "new" problem spend at least two, better five, minutes to look if this problem was posted before. If it was, don't repost it. If you have anything important to say on topic, post it in one of the older threads.
If the thread is locked cause of this, use search function.

Update (by Amir Hossein). The best way to search for two keywords in AoPS is to input
[code]+"first keyword" +"second keyword"[/code]
so that any post containing both strings "first word" and "second form".


c) Good problem statement:
Some recent really bad post was:
[quote]$lim_{n\to 1}^{+\infty}\frac{1}{n}-lnn$[/quote]
It contains no question and no answer.
If you do this, too, you are on the best way to get your thread deleted. Write everything clearly, define where your variables come from (and define the "natural" numbers if used). Additionally read your post at least twice before submitting. After you sent it, read it again and use the Edit-Button if necessary to correct errors.


For answers to already existing threads:


d) Of any interest and with content:
Don't post things that are more trivial than completely obvious. For example, if the question is to solve $x^{3}+y^{3}=z^{3}$, do not answer with "$x=y=z=0$ is a solution" only. Either you post any kind of proof or at least something unexpected (like "$x=1337, y=481, z=42$ is the smallest solution). Someone that does not see that $x=y=z=0$ is a solution of the above without your post is completely wrong here, this is an IMO-level forum.
Similar, posting "I have solved this problem" but not posting anything else is not welcome; it even looks that you just want to show off what a genius you are.

e) Well written and checked answers:
Like c) for new threads, check your solutions at least twice for mistakes. And after sending, read it again and use the Edit-Button if necessary to correct errors.



To repeat it: ALWAYS USE YOUR COMMON SENSE IF POSTING!


Everything definitely out of range of common sense will be locked or deleted (exept for new users having less than about 42 posts, they are newbies and need/get some time to learn).

The above rules will be applied from next monday (5. march of 2007).
Feel free to discuss on this here.
49 replies
ZetaX
Feb 27, 2007
NoDealsHere
May 4, 2019
A convex pentagon has rational sides and equal angles
Valentin Vornicu   2
N an hour ago by Qing-Cloud
Source: Balkan MO 2001, problem 2
A convex pentagon $ABCDE$ has rational sides and equal angles. Show that it is regular.
2 replies
Valentin Vornicu
Apr 24, 2006
Qing-Cloud
an hour ago
Hard diophant equation
MuradSafarli   3
N 2 hours ago by MuradSafarli
Find all positive integers $x, y, z, t$ such that the equation

$$
2017^x + 6^y + 2^z = 2025^t
$$
is satisfied.
3 replies
MuradSafarli
Yesterday at 6:12 PM
MuradSafarli
2 hours ago
< NA'T = < ADT wanted, starting with a right triangle, symmetric, projections
parmenides51   3
N 2 hours ago by tilya_TASh
Source: JBMO Shortlist 2018 G2
Let $ABC$ be a right angled triangle with $\angle A = 90^o$ and $AD$ its altitude. We draw parallel lines from $D$ to the vertical sides of the triangle and we call $E, Z$ their points of intersection with $AB$ and $AC$ respectively. The parallel line from $C$ to $EZ$ intersects the line $AB$ at the point $N$. Let $A' $ be the symmetric of $A$ with respect to the line $EZ$ and $I, K$ the projections of $A'$ onto $AB$ and $AC$ respectively. If $T$ is the point of intersection of the lines $IK$ and $DE$, prove that $\angle NA'T = \angle  ADT$.
3 replies
parmenides51
Jul 22, 2019
tilya_TASh
2 hours ago
x(x - y) = 8y - 7 in NxN
parmenides51   4
N 2 hours ago by Namisgood
Source: JBMO 2008 Shortlist N1
Find all the positive integers $x$ and $y$ that satisfy the equation $x(x - y) = 8y - 7$
4 replies
parmenides51
Oct 14, 2017
Namisgood
2 hours ago
IMO Genre Predictions
ohiorizzler1434   3
N 3 hours ago by NicoN9
Everybody, with IMO upcoming, what are you predictions for the problem genres?


Personally I predict: predict
3 replies
ohiorizzler1434
3 hours ago
NicoN9
3 hours ago
Insects walk
Giahuytls2326   0
3 hours ago
Source: somewhere in the internet
A 100 × 100 chessboard is divided into unit squares. Each square has an arrow pointing up, down, left, or right. The board square is surrounded by a wall, except to the right of the top right corner square. An insect is placed in one of the squares.

Every second, the insect moves one unit in the direction of the arrow in its square. As the insect moves, the arrow of the square it just left rotates 90° clockwise.

If the specified movement cannot be performed, then the insect will not move for that second, but the arrow in the square it is standing on will still rotate. Is it possible that the insect never leaves the board?
0 replies
Giahuytls2326
3 hours ago
0 replies
Floor function
Ro.Is.Te.   4
N 3 hours ago by aidan0626
Find all the real solution for this equation $$\left\lfloor \frac{x}{2} \right\rfloor + \left\lfloor \frac{2x}{3} \right\rfloor = x$$
4 replies
Ro.Is.Te.
Today at 1:53 AM
aidan0626
3 hours ago
A twist on a classic
happypi31415   13
N 3 hours ago by brownbear.bb
Rank from smallest to largest: $\sqrt[2]{2}$, $\sqrt[3]{3}$, and $\sqrt[5]{5}$.

Click to reveal hidden text
13 replies
happypi31415
Mar 17, 2025
brownbear.bb
3 hours ago
AM-GM Inequalitie with square root
NiltonCesar   3
N 3 hours ago by brownbear.bb
For $x \geq 0$, show that
$2x+\frac{3}{8} \geq 4\sqrt{x}$.
3 replies
NiltonCesar
Apr 27, 2025
brownbear.bb
3 hours ago
Equal sum of digits
Fudicuehfosonrcjeong   0
3 hours ago
Is it true that for any two positive integers a, b there exists a positive integer k such that s(ka)=s(kb), where s(n) is sum of digits in base 10?
0 replies
Fudicuehfosonrcjeong
3 hours ago
0 replies
Common tangent of mixtilinear incircles
CyclicISLscelesTrapezoid   3
N 3 hours ago by Ilikeminecraft
Source: MOP 2020/1Z
Let $ABCD$ be a quadrilateral inscribed in circle $\Omega$. Circles $\omega_A$ and $\omega_D$ are drawn internally tangent to $\Omega$, such that $\omega_A$ is tangent to $\overline{AB}$ and $\overline{AC}$ while $\omega_D$ is tangent to $\overline{DB}$ and $\overline{DC}$. Prove that we can draw a line parallel to $\overline{AD}$ which is simultaneously tangent to both $\omega_A$ and $\omega_D$.
3 replies
CyclicISLscelesTrapezoid
Jan 6, 2023
Ilikeminecraft
3 hours ago
Construct
Pomegranat   2
N 4 hours ago by Blackbeam999
Source: idk
Let \( p \) be a prime number. Prove that there exists a natural number \( n \) such that
\[
p \mid m^n - n.
\]
2 replies
Pomegranat
Apr 30, 2025
Blackbeam999
4 hours ago
square root problem
kjhgyuio   2
N 4 hours ago by wh0nix
........
2 replies
kjhgyuio
5 hours ago
wh0nix
4 hours ago
How to get a 300+ on the NWEA MAP MATH test (URGENT)
nmlikesmath   11
N 6 hours ago by nmlikesmath
I have 4 days till this test, I'm wondering how do I get a 300+ and what do I need to know, thank you.
11 replies
nmlikesmath
Today at 1:57 AM
nmlikesmath
6 hours ago
Geometry Transformation Problems
ReticulatedPython   7
N Apr 22, 2025 by ReticulatedPython
Problem 1:
A regular hexagon of side length $1$ is rotated $360$ degrees about one side. The space through which the hexagon travels during the rotation forms a solid. Find the volume of this solid.

Problem 2:

A regular octagon of side length $1$ is rotated $360$ degrees about one side. The space through which the octagon travels through during the rotation forms a solid. Find the volume of this solid.

Source:Own

Hint

Useful Formulas
7 replies
ReticulatedPython
Apr 17, 2025
ReticulatedPython
Apr 22, 2025
Geometry Transformation Problems
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G H BBookmark kLocked kLocked NReply
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ReticulatedPython
615 posts
#1
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Problem 1:
A regular hexagon of side length $1$ is rotated $360$ degrees about one side. The space through which the hexagon travels during the rotation forms a solid. Find the volume of this solid.

Problem 2:

A regular octagon of side length $1$ is rotated $360$ degrees about one side. The space through which the octagon travels through during the rotation forms a solid. Find the volume of this solid.

Source:Own

Hint

Useful Formulas
This post has been edited 11 times. Last edited by ReticulatedPython, Apr 21, 2025, 3:33 PM
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jb2015007
1931 posts
#2
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ack i hate transformation problems and i suck at them so ill do this lol ill do it when i get home from school
@reticulated python check out the problem i posted in the intro to geo message board its real interesting
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ReticulatedPython
615 posts
#3
Y by
Ok I will.
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ReticulatedPython
615 posts
#4
Y by
Anyone want to give it a try?
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cheltstudent
619 posts
#5
Y by
wait which intro to geo class is this
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ReticulatedPython
615 posts
#6
Y by
\bump :)
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ReticulatedPython
615 posts
#7
Y by
I will present the solution to problem 1 and see if anyone can use that to solve problem 2. Solution
This post has been edited 2 times. Last edited by ReticulatedPython, Apr 21, 2025, 7:26 PM
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ReticulatedPython
615 posts
#8
Y by
Alright I will give the answer to problem 2; the method is similar to that of problem 1. Answer
This post has been edited 1 time. Last edited by ReticulatedPython, Apr 22, 2025, 3:31 PM
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