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0:04:49

IMO 1963 Problem 5 + Extension (Special Trigonometric Values about π/7)

0:03:29

IMO 1962 Problem 4 solved by 2 Trigonometric FORMULAS in only 3.5 min

0:06:29

IMO 1962 Problem 6 VS Euler’s Triangle Theorem (completely explained)

0:06:31

IMO 1985 Problem 1: The EASIEST Geometry Question in the HARDEST Math Competition

0:05:41

Math Olympiad Training: Half Area of Equilateral Triangle by Simple Tools

0:04:20

The SECRET Ratio of Areas of Regular Heptagon to Heptagram (7-pointed star)

0:03:38

Math Olympiad: REALLY Enough Conditions to find Angle from Nowhere in 2 Circles?

0:07:58

(Probably) The most Complete Guide of sin 18° & cos 36° by 2 Methods (with Animation)

0:02:53

Math Olympiad Challenge in 3 min: 3-4-5 & Area of Equilateral Triangle

0:08:43

Math Olympiad Radius Ratio of 2 Circles in a Quarter (Algebra + Geometry)

0:04:53

Math Olympiad: Volume Ratio of Cylinder, Sphere & Cone

0:04:41

Math Olympiad: How many Circles can be Inscribed in a Rectangle?

0:04:49

When CIRCLE meets Parabola (No Calculus needed!)

0:06:42

Archimedes' work in Geometry: In-circle of Arbelos

0:07:31

How to solve a MATH OLYMPIAD Area Problem by SIMPLE TOOLS?

0:20:28

Math Olympiad Amazing Geometry Puzzle of Area, solved by Dozens of Math tools!

0:19:02

Classical Geometry Problem with 9 different Approaches in Trigonometry, Algebra and more......

0:04:50

Best Use of Secant-Secant Theorem to find Chord of Circle

0:02:00

Did you think of putting a Circle on a Parallelogram? (Nice Geometry Skill)

0:02:45

Fast Tricks of Optimization in Geometry Puzzle

0:02:42

A nice Circle: game changer of hard question of angles between 2 Squares

0:03:33

Challenging Geometry Problem of Area with 3 Mid-points in 3 min 33 seconds

0:03:25

Coordinate Geometry does a great job in Geometry Puzzle!

0:04:18

A Simple Geometry Question of Square with INCREDIBLE Solution