Michael Greenberg

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1:32:58

LIVESTREAM GEO #123B One Hard and two Easy from the Korea Winter Camp!

Michael Greenberg

2.5K views·2 years ago

1:24:07

LIVESTREAM GEO #123A A Very Instructive Application of Sqrt(bc) Inversion!

Michael Greenberg

1.4K views·2 years ago

1:22:27

LIVESTREAM GEO #122B Two Hard Problems from Two Mock Geo Contests - We Didn't Solve Either!

Michael Greenberg

821 views·2 years ago

1:36:22

LIVESTREAM GEO #122A Using Symmetry to Prove a Radical Axis Bisects a Segment!

Michael Greenberg

937 views·2 years ago

1:55:21

LIVESTREAM GEO #121B Turning One Problem Into a New One with Sqrt(bc) Inversion!

Michael Greenberg

784 views·2 years ago

1:03:39

LIVESTREAM GEO #121A Finding the Right Application of Desargues!

Michael Greenberg

631 views·2 years ago

1:15:33

LIVESTREAM GEO #120B Two Triangles with the Same Orthocenter and Circumcenter!

Michael Greenberg

861 views·2 years ago

1:38:16

LIVESTREAM GEO #120A Two Problems from the Recently Released 2022 IMO Shortlist!

Michael Greenberg

606 views·2 years ago

1:23:38

LIVESTREAM GEO #119B A Unique Solution by Reflecting a Poncelet Point!

Michael Greenberg

506 views·2 years ago

1:38:18

LIVESTREAM GEO #119A From the 2023 IMO (Problem 2)!

Michael Greenberg

1.3K views·2 years ago

1:25:04

LIVESTREAM GEO #118B An Inversion with Respect to the Excircle!

Michael Greenberg

799 views·2 years ago

1:37:00

LIVESTREAM GEO #118 A Nice Problem Involving Isogonal Lines and Similar Triangles!

Michael Greenberg

662 views·2 years ago

1:25:44

LIVESTREAM GEO #117B A Combination of Homothety and PolePolar!

Michael Greenberg

721 views·2 years ago

1:34:38

LIVESTREAM GEO #117A Yet Another Problem Involving Line IO, Solved with Vectors!

Michael Greenberg

581 views·2 years ago

1:16:29

LIVESTREAM GEO #116B Lots of Parallel Lines and Ratios!

Michael Greenberg

523 views·2 years ago

1:43:34

LIVESTREAM GEO #116A A Very Cool China TST Problem Involving the Line IO!

Michael Greenberg

1.0K views·2 years ago

55:40

LIVESTREAM GEO #115B A Very Tough Anti-Steiner Point Problem!

Michael Greenberg

739 views·2 years ago

2:04:48

LIVESTREAM GEO #115A We Proved a Deep but Unnecessary Fact, then Solved the Original Problem!

Michael Greenberg

511 views·2 years ago

1:33:29

LIVESTREAM GEO #114B The Last Problem Was My Favorite!

Michael Greenberg

606 views·2 years ago

1:25:50

LIVESTREAM GEO #114A An Excellent Recent Problem from the Serbia IMO Team Selection Test!

Michael Greenberg

718 views·2 years ago

1:36:41

LIVESTREAM GEO #113B A Tricky Fixed Point Problem from an AoPS Geo Marathon!

Michael Greenberg

411 views·2 years ago

1:22:54

LIVESTREAM GEO #113A Finding the Right Similar Triangles

Michael Greenberg

143 views·2 years ago

1:31:47

LIVESTREAM GEO #112B Two Equal Incircles Problems From the Romantics of Geometry Facebook Group!

Michael Greenberg

355 views·2 years ago

1:26:30

LIVESTREAM GEO #112A A Mix of Easy and Hard Problems from the Thailand TST!

Michael Greenberg

168 views·2 years ago

1:28:49

LIVESTREAM GEO #111B Isogonal Conjugates in Two Different Quadrilaterals!

Michael Greenberg

470 views·2 years ago

1:31:44

LIVESTREAM GEO #111A A Highly Theoretical Solution Using the Cayley Bacharach Theorem!

Michael Greenberg

388 views·2 years ago

1:47:13

LIVESTREAM GEO #110B Reflections of Reflections!

Michael Greenberg

376 views·3 years ago

1:19:34

LIVESTREAM GEO #110A Two Excellent Problems from the Romantics of Geometry Facebook Group!

Michael Greenberg

473 views·3 years ago

1:25:13

LIVESTREAM GEO #109B A Few Easier Ones, then a Really Hard One (Which We Didn't Solve!)

Michael Greenberg

360 views·3 years ago

1:33:38

LIVESTREAM GEO #109A Moving Points from Vietnam!

Michael Greenberg

592 views·3 years ago

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