Square as a Sum

Depiction of how a square can be expressed as a sum of odd numbers.

Tags: Square, Discrete

Euclids Elements - Book 2 - Proposition 14

One of my favorite apps because it looks deceptively simple, but takes some really creative thinking. This app creates a square (in red) that has the same area as a given quadrilateral.

Tags: Euclid, Elements, Geometry, Square, Quadrilateral

Tangrams

Drag the tangrams to make your favorite shape.  Then press Go to see them move from their square to your shape.

Tags: tangrams