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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
Introduction
"Compressed" Astroid as Envelope
Slope Field (1)
Limaçon / Cardioid as a Locus - A Classical Construction
Linear Cross Section Exercise
Discover Resources
cone3D
Hyperbola [foci]
Indices
philip
การบวกลบจำนวนเต็ม
Discover Topics
Tangent Line or Tangent
Polygons
Vectors 3D (Three-Dimensional)
Fractions
Mode