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Proof Without Words
Author:
Šárka Voráčová
,
Steve Phelps
Drag the points in the sketch below. What do you notice? What does this prove? How does this prove it?
GeoGebra
Proof by H. Perigal (1830) and H. E. Dudeney (1917) See Cut the Knot:
Pythagorean Theorem
New Resources
Dissections by Guillermo Bautista
Droste effect
Poorly Drawn Parallelograms 2
Droste effect draft
Variation Theory Parallelogram Proofs
Discover Resources
The Reflection Triangle and the Orthocenter
კუბი
Inertial ellipsoid
Example 3
Začetek par, fruit of life... 3
Discover Topics
Exponent
Quadratic Equations
Geometry
Sine
Rotation