A Miraculous Proof (Ptolemy's Theorem) - Numberphile

Superhero Triangles - Numberphile

Epic Induction - Numberphile

Ptolemy’s Theorem and the Almagest: we just found the best visual proof in 2000 years

Epic Circles - Numberphile

Why was this visual proof missed for 400 years? (Fermat's two square theorem)

Darts in Higher Dimensions (with 3blue1brown) - Numberphile

Cow-culus and Elegant Geometry - Numberphile

The Goat Problem - Numberphile

A Beautiful Proof of Ptolemy's Theorem.

Algebra Basics: What Is Algebra? - Math Antics

Math's Fundamental Flaw

The Light Switch Problem - Numberphile

The Bridges to Fermat's Last Theorem - Numberphile

How Imaginary Numbers Were Invented

The Golden Ratio (why it is so irrational) - Numberphile

The Notorious Question Six (cracked by Induction) - Numberphile

Pebbling a Chessboard - Numberphile

Inversion and Ptolemy's Theorem

Riemann Hypothesis - Numberphile

The Riemann Hypothesis, Explained