Think Twice

Generating Conic Sections with Circles | Part 3. The Hyperbola

Generating Conic Sections with Circles | Part 2. The Parabola

Generating Conic Sections with Circles | Part 1. The Ellipse

Euler's Formula V - E + F = 2 | Proof

Every Polygon can be Triangulated Into Exactly n-2 Triangles | Proof by Induction

Spherical Geometry: Deriving The Formula For The Area Of A Spherical Triangle

The Fermat Point of a Triangle | Geometric construction + Proof |

A fun probability puzzle with a neat geometric solution.

Constructing a Square of Equal Area to a given Polygon

Alternating series #2 | Visual solution |

Visual Calculus: Derivative of sin(θ) is cos(θ)

What is the area under an arc of a cycloid curve?

Napoleon's theorem | Proof |

Cavalieri's Principle in 3D | Volume of a sphere |

Alternating series #1 | Visual solution |

Pythagorean theorem | 3 Visual Proofs |

Approximating Pi ( Monte Carlo integration ) | animation

Finding the general formula for nth octagonal number | Visual proof |

Arithmetic mean vs Geometric mean | inequality among means | visual proof

Infinite Sums | Geometric Series | Explained Visually

Geometry of Binomial Theorem | Visual Representation | 2 examples

Four squares with constant area | Visual Proof | Squaring the segments |

Geometry: Viviani's theorem | Visualization + Proof |

Fitting a Cube Through a Copy of Itself | Rupert's Cube |