A STUNNING proof of Newton's theorem using parallelograms only!
Channel: Aha Problems
Date: 20/03/2024

We present Roger Johnson's elegant proof of Newton-Gauss theorem.

00:00 Statement of Newton-Gauss theorem.
00:30 Fact 1 (about areas of parallelograms)
01:30 Fact 2 (converse of midpoint theorem)
01:52 Johnson's proof of Newton-Gauss theorem.

This theorem is a classic olympiad side-dish.