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k a April Highlights and 2025 AoPS Online Class Information
jlacosta   0
Apr 2, 2025
Spring is in full swing and summer is right around the corner, what are your plans? At AoPS Online our schedule has new classes starting now through July, so be sure to keep your skills sharp and be prepared for the Fall school year! Check out the schedule of upcoming classes below.

WOOT early bird pricing is in effect, don’t miss out! If you took MathWOOT Level 2 last year, no worries, it is all new problems this year! Our Worldwide Online Olympiad Training program is for high school level competitors. AoPS designed these courses to help our top students get the deep focus they need to succeed in their specific competition goals. Check out the details at this link for all our WOOT programs in math, computer science, chemistry, and physics.

Looking for summer camps in math and language arts? Be sure to check out the video-based summer camps offered at the Virtual Campus that are 2- to 4-weeks in duration. 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 events:
[list][*]April 3rd (Webinar), 4pm PT/7:00pm ET, Learning with AoPS: Perspectives from a Parent, Math Camp Instructor, and University Professor
[*]April 8th (Math Jam), 4:30pm PT/7:30pm ET, 2025 MATHCOUNTS State Discussion
April 9th (Webinar), 4:00pm PT/7:00pm ET, Learn about Video-based Summer Camps at the Virtual Campus
[*]April 10th (Math Jam), 4:30pm PT/7:30pm ET, 2025 MathILy and MathILy-Er Math Jam: Multibackwards Numbers
[*]April 22nd (Webinar), 4:00pm PT/7:00pm ET, Competitive Programming at AoPS (USACO).[/list]
Our full course list for upcoming classes is below:
All classes run 7:30pm-8:45pm ET/4:30pm - 5:45pm PT unless otherwise noted.

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jlacosta
Apr 2, 2025
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Geometry
AlexCenteno2007   1
N 3 minutes ago by AlexCenteno2007
Let ABC be an acute triangle and let D, E and F be the feet of the altitudes from A, B and C respectively. The straight line EF and the circumcircle of ABC intersect at P such that F is between E and P, the straight lines BP and DF intersect at Q. Show that if ED = EP then CQ and DP are parallel.
1 reply
AlexCenteno2007
Yesterday at 3:59 PM
AlexCenteno2007
3 minutes ago
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Product of all even divisors
girishpimoli   4
N 8 minutes ago by williamxiao
$(1)$ Product of all even divisors of $9000$

$(2)$ If $4$ dice are rolled, Then number of ways of getting sum at least $13$ is
4 replies
girishpimoli
Yesterday at 2:13 PM
williamxiao
8 minutes ago
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Basic geometry
AlexCenteno2007   3
N 14 minutes ago by AlexCenteno2007
Given an isosceles triangle ABC with AB=BC, the inner bisector of Angle BAC And cut next to it BC in D. A point E is such that AE=DC. The inner bisector of the AED angle cuts to the AB side at the point F. Prove that the angle AFE= angle DFE
3 replies
AlexCenteno2007
Feb 9, 2025
AlexCenteno2007
14 minutes ago
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About my new website
Samujjal101   16
N 14 minutes ago by Samujjal101
Hi everybody!
I'm registering some of the finest minds in math into my website.. it's not completely developed.. but still if you want we would be very grateful to have you!
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Maths-matchmaker is a website for connecting math minds together with a mission to unite together. It uses a matching algorithm to match 1:1 with like minded peers based on their interests or topics in math
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Samujjal101
Yesterday at 2:28 PM
Samujjal101
14 minutes ago
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2014 preRMO p15, computational with right triangle and midpoints
parmenides51   1
N Aug 9, 2019 by NikoIsLife
Let $XOY$ be a triangle with $\angle XOY = 90^o$. Let $M$ and $N$ be the midpoints of legs $OX$ and $OY$, respectively. Suppose that $XN = 19$ and $YM =22$. What is $XY$?
1 reply
parmenides51
Aug 9, 2019
NikoIsLife
Aug 9, 2019
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2014 preRMO p15, computational with right triangle and midpoints
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Reveal topic tags
geometry
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parmenides51
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parmenides51
#1 h  Aug 9, 2019, 12:35 AM • 2 Y
Y by Adventure10, Mango247
Let $XOY$ be a triangle with $\angle XOY = 90^o$. Let $M$ and $N$ be the midpoints of legs $OX$ and $OY$, respectively. Suppose that $XN = 19$ and $YM =22$. What is $XY$?
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NikoIsLife
9657 posts
NikoIsLife
#2 h  Aug 9, 2019, 12:39 AM • 2 Y
Y by Adventure10, Mango247
Solution
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