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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
Ellipse as Envelope - Correspondence Method
Angles and Intersecting Lines: Quick Investigation
Rotating Points (Optical Illusion)
Isosceles Triangle: Quick Construction
Introduction
Discover Resources
Regression line and sum of squares
Gravity Test
memet%2c1
Similar Circles
calcul couleur
Discover Topics
Geometry
Incircle or Inscribed Circle
Coordinates
Linear Programming or Linear Optimization
Parabola