Art of Problem Solving Forum

Try our innovative online adaptive learning system, Alcumus.
Over 1100 problems and 60+ video lessons. FREE!

The time now is Sun Nov 22, 2009 4:12 pm
All times are UTC - 8

View posts since last visit
View unanswered posts

Geometry Theorems and Formulas

Moderators: High School Olympiad Moderators, darij grinberg, N.T.TUAN, orl, pbornsztein, pohoatza, yetti

Home » Olympiad Section » Geometry » Geometry Theorems and Formulas

308 Topics • Page 3 of 7 • Previous 1, 2, 3, 4, 5, 6, 7 Next

Announcements			Author	Replies	Views	Last Post
		Kiran Kedlaya's Geometry Unbound	rrusczyk	8	7770	Fri Jan 02, 2009 6:49 am #H34N1

Topics		Author	Replies	Views	Last Post
	Steinbart's theorem	Labiliau	2	1688	Sun Jun 01, 2008 2:14 am jayme
	help me !	nguyenvanteoo	5	1040	Fri May 30, 2008 6:57 am nguyenvanteoo
	Complex numbers geometry question	meinstein	2	1050	Sun May 04, 2008 10:43 am wallace
	A nice locus	balan razvan	0	536	Sun Apr 06, 2008 4:20 am balan razvan
	Pedal Line or Simson Line Book	kalyanram_a	4	1717	Sun Apr 06, 2008 12:04 am balan razvan
	what is the gergonne point	Jonh	6	2327	Sat Apr 05, 2008 10:52 pm balan razvan
	Geometry Excentral Triangle and Bevan circle	tkay16	0	493	Thu Apr 03, 2008 5:03 am tkay16
	Neuberg Theorem [actually Floor van Lamoen's circle] Prasolov (problem 5.17)	shobber	2	1882	Tue Apr 01, 2008 9:41 pm jayme
	ABCD with AB = BC = CD and <BAD + <ADC = 120	CDP100	3	1141	Mon Mar 31, 2008 5:30 am thanhnam2902
	Please help! harmonic division	morheli	1	644	Fri Mar 21, 2008 12:58 am ¬[ƒ(Gabriel)³²¹º]¼
	Droz Farny circle	Leonhard Euler	1	971	Sun Feb 24, 2008 8:20 am pohoatza
	An analytical square. Classic.	Virgil Nicula	0	683	Mon Feb 04, 2008 2:42 pm Virgil Nicula
	Affine Transformation	ybkb	0	604	Thu Jan 31, 2008 1:35 pm ybkb
	Trigonometric Triangle Formulas Looking for a link	FOURRIER	11	2363	Wed Jan 30, 2008 2:43 am darij grinberg
	dIrected line	Leonhard Euler	3	943	Tue Jan 22, 2008 1:59 am Leonhard Euler
	Geometrical Inequalities proof using harmonics and projetcive (BaBaK,Darij,April,Erken,Virgil....)	pardesi	2	921	Thu Jan 17, 2008 8:13 am pardesi
	projection	pardesi	1	669	Sun Jan 13, 2008 2:19 pm Altheman
	directed angle	Leonhard Euler	2	923	Sun Dec 09, 2007 11:46 am darij grinberg
	Trigonometric identities How prove this?	soruz	2	914	Mon Dec 03, 2007 5:41 am BaBaK Ghalebi
	Harmonic divisons	D.P.L	3	953	Thu Nov 29, 2007 11:47 pm BaBaK Ghalebi
	geometry of 12-fold square rectangle quasicrystal	e_ali_e	0	571	Tue Nov 13, 2007 12:39 pm e_ali_e
	Two important lemmas. Some remarkable aplications.	Virgil Nicula	1	1443	Tue Nov 13, 2007 12:21 am Virgil Nicula
	"Isotomic" triangles have equal areas classical; e. g.: [apparently Arthur] Engel, Praxis der Mathematik problem P144; used in 4th QEDMO	darij grinberg	3	1042	Sat Nov 10, 2007 6:54 pm April
	"Triple-ratios" are also projectively invariant 5th QEDMO problem 8, proposed by me but apparently known before	darij grinberg	1	747	Sat Nov 10, 2007 5:51 am darij grinberg
	What is antipodal?	canada	2	876	Thu Nov 08, 2007 4:11 pm canada
	radius of apollonius circle net	vinoth_90_2004	3	4289	Fri Nov 02, 2007 2:35 am darij grinberg
	the name of that theorem :-?	BG Yoda	1	835	Thu Nov 01, 2007 7:25 am bertram
	A fundamental geometrical inequalities in a triangle. Classic.	Virgil Nicula	0	826	Mon Oct 15, 2007 1:20 pm Virgil Nicula
	Formulas about exradius ! I need proof of or a link where I found that-Help me!	soruz	3	1276	Fri Oct 12, 2007 8:38 am Erken
	fundamental theorem central and parallell projection	pardesi	0	695	Sat Oct 06, 2007 9:11 am pardesi
	Rigid Motion Doubt in Kedlaya's notes	pardesi	1	774	Fri Oct 05, 2007 11:18 am pardesi
	Locus	canada	0	613	Tue Oct 02, 2007 12:46 pm canada
	ASK FOR euler theorem A very good theorem of inequality	wxydx00	2	907	Sat Sep 22, 2007 9:36 pm wxydx00
	An usual remarkable geometrical locus. Classic.	Virgil Nicula	0	736	Fri Sep 14, 2007 3:45 pm Virgil Nicula
	Casey theorem on radical axes	thanhnam2902	2	922	Wed Sep 12, 2007 6:20 am thanhnam2902
	about sin	Leonhard Euler	0	566	Sat Sep 08, 2007 11:33 pm Leonhard Euler
	directed area	Leonhard Euler	0	554	Sat Sep 08, 2007 8:04 am Leonhard Euler
	Euler's [OI^2 = R(R-2r) in a triangle ABC]	shobber	14	4385	Tue Sep 04, 2007 1:54 am Leonhard Euler
	Law Of Tangents!	sinajackson	0	645	Mon Aug 27, 2007 10:28 pm sinajackson
	Inspired by a Miculita's problem. Two problems with ratio in a triangle.	Virgil Nicula	0	704	Thu Aug 16, 2007 2:20 pm Virgil Nicula
	About circumscriptibility. Classic.	Virgil Nicula	0	809	Fri Aug 10, 2007 11:19 pm Virgil Nicula
	orthogonal	N.T.TUAN	2	788	Fri Aug 03, 2007 4:12 pm N.T.TUAN
	Cyclic China	Fang-jh	1	869	Mon Jul 30, 2007 6:07 am pohoatza
	concur Orthologic Triangles Theorem	nealth	3	689	Mon Jul 30, 2007 1:14 am darij grinberg
	Some properties of equilateral triangle and regular polygon Base on a vectorial identity	gemath	0	865	Tue Jul 24, 2007 9:32 am gemath
	Kosnita point - nine-point center	Sofeto_89	6	2088	Sat Jul 21, 2007 8:04 am PDatK40SP
	Isogonal Conjugate: Error in MathWorld? The equation (3) in MathWorld link for "Isogonal Conjugate" may be wrong.	hjbortol	1	817	Thu Jul 19, 2007 9:14 am darij grinberg
	barycenters	georg	1	808	Thu Jul 19, 2007 9:10 am darij grinberg
	Platonic solids	IrinaSharova	3	874	Tue Jul 17, 2007 11:33 am perfect_radio
	Ayana's Theorem	gahia	2	957	Sun Jul 15, 2007 5:06 am vittasko
Display topics from previous: Sort by:

308 Topics • Page 3 of 7 • Previous 1, 2, 3, 4, 5, 6, 7 Next

Home » Olympiad Section » Geometry » Geometry Theorems and Formulas

Jump to:

Who is Online
	Users browsing this forum: 0 Registered, 0 Hidden and 1 Guest Registered Users: None
	Legend: [ Administrator ][ Moderator ][ User ][ Bot ]

	New posts			Announcement
	No new posts			Sticky
	Popular			Event
	Locked			Moved
	You have posted in this topic

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
You cannot post calendar events in this forum