Pythagoras proofs
Picture proofs that a² + b² = c².
- Perigal Leg squares to the hypotenuse square
- Bhaskara Two leg squares to the hypotenuse square
- Thabit ibn Qurra Two cuts, two quarter turns
- an-Nayrizi The tiling proof
- Four triangles Leave the hypotenuse square open
- Liu Hui, out-in (Wagner's reconstruction; needs a flip)
- Two equal hexagons (Mayer; often called Leonardo's; needs a flip)