A Beautiful Proof of Ptolemy's Theorem.
6:51
No Calculus Needed?! How to Maximize Range Using Simple Geometry.
32:54
Ptolemy’s Theorem and the Almagest: we just found the best visual proof in 2000 years
13:06
Proof using Complex Numbers: Ptolemy's Theorem
38:33
Pythagoras twisted squares: Why did they not teach you any of this in school?
11:12
The Fantastic New Trigonometric Proof of the Pythagorean Theorem #SoME3
6:53
A nice Olympiad qualifying question from the Philippines
5:11
A Fun Proof of Van Aubel's Theorem.
38:28