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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
Isosceles Triangle: Quick Construction
Construct a Square
Introduction
Slope of a Straight Line: Run and Rise
Teorema Japonês para quadriláteros inscritos em uma circunferência
Discover Resources
The value of Pi
quartic
Sequence of Transformation #2
proposition 17
Integral
Discover Topics
Square
Step Functions
Logarithm
Kite
Standard Deviation